256 Desgrees Black to White Basic Art and Design

  1. Photoshop User Guide
  2. Introduction to Photoshop
    1. Dream information technology. Get in.
    2. What'due south new in Photoshop
    3. Edit your kickoff photograph
    4. Create documents
    5. Photoshop | Common Questions
    6. Photoshop organization requirements
    7. Migrate presets, actions, and settings
    8. Get to know Photoshop
  3. Photoshop and Adobe services
    1. Photoshop and Adobe Stock
    2. Creative Cloud Libraries
    3. Creative Cloud Libraries in Photoshop
    4. Use the Touch Bar with Photoshop
    5. Piece of work with Illustrator artwork in Photoshop
    6. Utilize the Capture in-app extension in Photoshop
    7. Grid and guides
    8. Creating actions
    9. Undo and history
    10. Default keyboard shortcuts
    11. Touch capabilities and customizable workspaces
  4. Photoshop on the iPad
    1. Photoshop on the iPad | Common questions
    2. Get to know the workspace
    3. System requirements | Photoshop on the iPad
    4. Create, open up, and export documents
    5. Add photos
    6. Work with layers
    7. Depict and pigment with brushes
    8. Brand selections and add masks
    9. Retouch your composites
    10. Work with adjustment layers
    11. Suit the tonality of your composite with Curves
    12. Use transform operations
    13. Crop and rotate your composites
    14. Rotate, pan, zoom, and reset the canvas
    15. Piece of work with Type layers
    16. Piece of work with Photoshop and Lightroom
    17. Go missing fonts in Photoshop on the iPad
    18. Japanese Text in Photoshop on the iPad
    19. Manage app settings
    20. Touch on shortcuts and gestures
    21. Keyboard shortcuts
    22. Edit your epitome size
    23. Livestream as you lot create in Photoshop on the iPad
    24. Right imperfections with the Healing Brush
    25. Create brushes in Capture and utilize them in Photoshop
    26. Work with Camera Raw files
    27. Create and work with Smart Objects
    28. Adapt exposure in your images with Dodge and Burn
  5. Photoshop on the web beta
    1. Common questions | Photoshop on the web beta
    2. Introduction to the workspace
    3. System requirements | Photoshop on the web beta
    4. Keyboard shortcuts | Photoshop on the web beta
    5. Supported file types | Photoshop on the web beta
    6. Open and work with cloud documents
    7. Interact with stakeholders
    8. Employ express edits to your deject documents
  6. Deject documents
    1. Photoshop deject documents | Common questions
    2. Photoshop deject documents | Workflow questions
    3. Manage and work with cloud documents in Photoshop
    4. Upgrade cloud storage for Photoshop
    5. Unable to create or salve a deject document
    6. Solve Photoshop cloud document errors
    7. Collect cloud document sync logs
    8. Share access and edit your deject documents
    9. Share files and annotate in-app
  7. Workspace
    1. Workspace basics
    2. Create documents
    3. Use the Bear on Bar with Photoshop
    4. Microsoft Punch back up in Photoshop
    5. Tool galleries
    6. Performance preferences
    7. Use tools
    8. Bear on gestures
    9. Touch capabilities and customizable workspaces
    10. Engineering science previews
    11. Metadata and notes
    12. Quickly share your creations
    13. Place Photoshop images in other applications
    14. Preferences
    15. Default keyboard shortcuts
    16. Rulers
    17. Prove or hide non-printing Extras
    18. Specify columns for an epitome
    19. Undo and history
    20. Panels and menus
    21. Place files
    22. Position elements with snapping
    23. Position with the Ruler tool
    24. Presets
    25. Customize keyboard shortcuts
    26. Filigree and guides
  8. Spider web, screen, and app pattern
    1. Photoshop for design
    2. Artboards
    3. Device Preview
    4. Re-create CSS from layers
    5. Piece web pages
    6. HTML options for slices
    7. Modify slice layout
    8. Work with web graphics
    9. Create web photo galleries
  9. Image and color basics
    1. How to resize images
    2. Work with raster and vector images
    3. Image size and resolution
    4. Acquire images from cameras and scanners
    5. Create, open, and import images
    6. View images
    7. Invalid JPEG Marker fault | Opening images
    8. Viewing multiple images
    9. Customize color pickers and swatches
    10. Loftier dynamic range images
    11. Lucifer colors in your image
    12. Convert between colour modes
    13. Color modes
    14. Erase parts of an image
    15. Blending modes
    16. Choose colors
    17. Customize indexed colour tables
    18. Prototype information
    19. Misconstrue filters are unavailable
    20. Well-nigh color
    21. Color and monochrome adjustments using channels
    22. Cull colors in the Colour and Swatches panels
    23. Sample
    24. Color style or Image mode
    25. Colour cast
    26. Add together a conditional mode change to an action
    27. Add together swatches from HTML CSS and SVG
    28. Flake depth and preferences
  10. Layers
    1. Layer basics
    2. Nondestructive editing
    3. Create and manage layers and groups
    4. Select, grouping, and link layers
    5. Place images into frames
    6. Layer opacity and blending
    7. Mask layers
    8. Apply Smart Filters
    9. Layer comps
    10. Movement, stack, and lock layers
    11. Mask layers with vector masks
    12. Manage layers and groups
    13. Layer effects and styles
    14. Edit layer masks
    15. Excerpt assets
    16. Reveal layers with clipping masks
    17. Generate image assets from layers
    18. Work with Smart Objects
    19. Blending modes
    20. Combine multiple images into a group portrait
    21. Combine images with Auto-Blend Layers
    22. Align and distribute layers
    23. Copy CSS from layers
    24. Load selections from a layer or layer mask's boundaries
    25. Knockout to reveal content from other layers
    26. Layer
    27. Flattening
    28. Composite
    29. Groundwork
  11. Selections
    1. Select and Mask workspace
    2. Brand quick selections
    3. Get started with selections
    4. Select with the marquee tools
    5. Select with the lasso tools
    6. Select a color range in an image
    7. Adjust pixel selections
    8. Convert between paths and selection borders
    9. Channel basics
    10. Move, re-create, and delete selected pixels
    11. Create a temporary quick mask
    12. Save selections and blastoff channel masks
    13. Select the paradigm areas in focus
    14. Duplicate, split, and merge channels
    15. Channel calculations
    16. Selection
    17. Bounding box
  12. Image adjustments
    1. Perspective warp
    2. Reduce camera milkshake blurring
    3. Healing brush examples
    4. Export color lookup tables
    5. Suit paradigm sharpness and blur
    6. Understand color adjustments
    7. Apply a Brightness/Contrast aligning
    8. Adjust shadow and highlight particular
    9. Levels adjustment
    10. Adjust hue and saturation
    11. Adjust vibrance
    12. Arrange color saturation in image areas
    13. Make quick tonal adjustments
    14. Apply special color effects to images
    15. Enhance your prototype with color remainder adjustments
    16. Loftier dynamic range images
    17. View histograms and pixel values
    18. Match colors in your paradigm
    19. How to crop and straighten photos
    20. Convert a color image to black and white
    21. Adjustment and fill layers
    22. Curves aligning
    23. Blending modes
    24. Target images for press
    25. Adjust color and tone with Levels and Curves eyedroppers
    26. Adapt HDR exposure and toning
    27. Filter
    28. Mistiness
    29. Contrivance or fire prototype areas
    30. Make selective colour adjustments
    31. Supercede object colors
  13. Adobe Camera Raw
    1. Photographic camera Raw organization requirements
    2. What's new in Camera Raw
    3. Introduction to Camera Raw
    4. Create panoramas
    5. Supported lenses
    6. Vignette, grain, and dehaze effects in Photographic camera Raw
    7. Default keyboard shortcuts
    8. Automated perspective correction in Camera Raw
    9. How to make non-destructive edits in Camera Raw
    10. Radial Filter in Camera Raw
    11. Manage Camera Raw settings
    12. Open up, procedure, and salvage images in Camera Raw
    13. Repair images with the Enhanced Spot Removal tool in Photographic camera Raw
    14. Rotate, crop, and adjust images
    15. Adjust color rendering in Photographic camera Raw
    16. Characteristic summary | Adobe Camera Raw | 2022 releases
    17. New features summary
    18. Procedure versions in Photographic camera Raw
    19. Make local adjustments in Camera Raw
  14. Image repair and restoration
    1. Remove objects from your photos with Content-Enlightened Fill up
    2. Content-Enlightened Patch and Motion
    3. Retouch and repair photos
    4. Right paradigm distortion and noise
    5. Basic troubleshooting steps to fix most bug
  15. Prototype transformations
    1. Transform objects
    2. Suit crop, rotation, and sail size
    3. How to crop and straighten photos
    4. Create and edit panoramic images
    5. Warp images, shapes, and paths
    6. Vanishing Signal
    7. Apply the Liquify filter
    8. Content-aware scaling
    9. Transform images, shapes, and paths
    10. Warp
    11. Transform
    12. Panorama
  16. Drawing and painting
    1. Paint symmetrical patterns
    2. Draw rectangles and modify stroke options
    3. Nigh cartoon
    4. Draw and edit shapes
    5. Painting tools
    6. Create and modify brushes
    7. Blending modes
    8. Add together color to paths
    9. Edit paths
    10. Pigment with the Mixer Brush
    11. Brush presets
    12. Gradients
    13. Gradient interpolation
    14. Fill and stroke selections, layers, and paths
    15. Describe with the Pen tools
    16. Create patterns
    17. Generate a blueprint using the Pattern Maker
    18. Manage paths
    19. Manage pattern libraries and presets
    20. Draw or paint with a graphics tablet
    21. Create textured brushes
    22. Add dynamic elements to brushes
    23. Slope
    24. Paint stylized strokes with the Fine art History Castor
    25. Pigment with a pattern
    26. Sync presets on multiple devices
  17. Text
    1. Work with OpenType SVG fonts
    2. Format characters
    3. Format paragraphs
    4. How to create type furnishings
    5. Edit text
    6. Line and grapheme spacing
    7. Arabic and Hebrew type
    8. Fonts
    9. Troubleshoot fonts
    10. Asian type
    11. Create blazon
    12. Text Engine fault using Type tool in Photoshop | Windows 8
    13. World-Gear up composer for Asian Scripts
    14. How to add together and edit the text in Photoshop
  18. Video and animation
    1. Video editing in Photoshop
    2. Edit video and blitheness layers
    3. Video and animation overview
    4. Preview video and animations
    5. Paint frames in video layers
    6. Import video files and image sequences
    7. Create frame animations
    8. Creative Cloud 3D Animation (Preview)
    9. Create timeline animations
    10. Create images for video
  19. Filters and effects
    1. Utilize the Liquify filter
    2. Employ the Blur Gallery
    3. Filter basics
    4. Filter furnishings reference
    5. Add Lighting Furnishings
    6. Apply the Adaptive Wide Bending filter
    7. Use the Oil Pigment filter
    8. Layer furnishings and styles
    9. Apply specific filters
    10. Smudge prototype areas
  20. Saving and exporting
    1. Save your files in Photoshop
    2. Export your files in Photoshop
    3. Supported file formats
    4. Save files in graphics formats
    5. Move designs between Photoshop and Illustrator
    6. Save and export video and animations
    7. Salve PDF files
    8. Digimarc copyright protection
  21. Printing
    1. Print 3D objects
    2. Print from Photoshop
    3. Print with color management
    4. Contact Sheets and PDF Presentations
    5. Print photos in a picture package layout
    6. Print spot colors
    7. Duotones
    8. Print images to a commercial printing printing
    9. Improve color prints from Photoshop
    10. Troubleshoot printing bug | Photoshop
  22. Automation
    1. Creating deportment
    2. Create data-driven graphics
    3. Scripting
    4. Procedure a batch of files
    5. Play and manage deportment
    6. Add conditional actions
    7. About actions and the Deportment panel
    8. Record tools in deportment
    9. Add together a conditional fashion change to an activity
    10. Photoshop UI toolkit for plug-ins and scripts
  23. Color Management
    1. Agreement color management
    2. Keeping colors consistent
    3. Color settings
    4. Work with color profiles
    5. Color-managing documents for online viewing
    6. Color-managing documents when printing
    7. Color-managing imported images
    8. Proofing colors
  24. Content authenticity
    1. Larn about content credentials
    2. Identity and provenance for NFTs
    3. Connect accounts for creative attribution
  25. 3D and technical imaging
    1. Photoshop 3D | Common questions around discontinued 3D features
    2. Creative Cloud 3D Animation (Preview)
    3. Print 3D objects
    4. 3D painting
    5. 3D console enhancements | Photoshop
    6. Essential 3D concepts and tools
    7. 3D rendering and saving
    8. Create 3D objects and animations
    9. Paradigm stacks
    10. 3D workflow
    11. Measurement
    12. DICOM files
    13. Photoshop and MATLAB
    14. Count objects in an image
    15. Combine and catechumen 3D objects
    16. 3D texture editing
    17. Conform HDR exposure and toning
    18. 3D panel settings

In Photoshop you can easily create an prototype in i color mode and convert it to another, perhaps to become information technology set up for a specific impress job.

Convert an paradigm to some other color mode

You tin can change an image from its original mode (source mode) to a different fashion (target mode). When you lot cull a dissimilar colour mode for an image, y'all permanently modify the color values in the image. For example, when you convert an RGB image to CMYK fashion, RGB color values outside the CMYK gamut (defined past the CMYK working space setting in the Color Settings dialog box) are adapted to autumn inside gamut. Equally a result, some prototype data may be lost and can't be recovered if you convert the image from CMYK dorsum to RGB.

Before converting images, it's best to do the post-obit:

  • Practise as much editing equally possible in the original image way (usually RGB for images from about scanners or digital cameras, or CMYK for images from traditional drum scanners or imported from a Scitex organisation).

  • Save a backup copy before converting. Exist certain to save a copy of your image that includes all layers and then that you can edit the original version of the epitome subsequently the conversion.

  • Flatten the file before converting information technology. The interaction of colors betwixt layer blending modes changes when the style changes.

In most cases, you'll desire to flatten a file before converting it. Withal, information technology isn't required and, in some cases, it isn't desirable (for example, when the file has vector text layers).

  1. Choose Paradigm > Way and the fashion you want from the submenu. Modes not available for the agile prototype announced dimmed in the menu.

    Images are flattened when converted to Multichannel, Bitmap, or Indexed Color mode, because these modes practice not support layers.

Catechumen an image to Bitmap fashion

Converting an image to Bitmap manner reduces the epitome to two colors, greatly simplifying the color information in the prototype and reducing its file size.

When converting a color image to Bitmap mode, first convert it to Grayscale mode. This removes the hue and saturation information from the pixels and leaves simply the brightness values. However, because simply a few editing options are bachelor for Bitmap mode images, it'south usually best to edit the prototype in Grayscale mode and then convert it to Bitmap mode.

Images in Bitmap way are 1 scrap per channel. You must convert a 16‑ or 32‑bits-per-channel image to eight‑chip Grayscale style before converting it to Bitmap mode.

    • If the image is in color, cull Image > Way > Grayscale. Then choose Epitome > Mode > Bitmap.

    • If the image is grayscale, cull Image > Mode > Bitmap.

  1. For Output, enter a value for the output resolution of the Bitmap mode image, and choose a unit of measurement. By default, the current image resolution appears every bit both the input and the output resolutions.

  2. Choose i of the following bitmap conversion methods from the Apply pop-up menu:

    50% Threshold

    Converts pixels with grayness values to a higher place the middle gray level (128) to white and pixels with gray values beneath that level to black. The effect is a very high-contrast, black-and-white representation of the image.

    Pattern Dither

    Converts an image past organizing the greyness levels into geometric configurations of black and white dots.

    Improvidence Dither

    Converts an prototype by using an error-diffusion procedure, starting at the pixel in the upper-left corner of the image. If the pixel's value is above heart gray (128), the pixel is changed to white—if below it, to black. Because the original pixel is rarely pure white or pure black, mistake is inevitably introduced. This fault is transferred to surrounding pixels and diffused throughout the image, resulting in a grainy, film-like texture.

    Halftone Screen

    Simulates the appearance of halftone dots in the converted paradigm. Enter values in the Halftone Screen dialog box:

    • For Frequency, enter a value for the screen frequency, and cull a unit. Values can range from 1.000 to 999.999 for lines per inch and from 0.400 to 400.00 for lines per centimeter. Yous tin can enter decimal values. The screen frequency specifies the ruling of the halftone screen in lines per inch (lpi). The frequency depends on the paper stock and type of press used for printing. Newspapers unremarkably utilise an 85‑line screen. Magazines use higher resolution screens, such every bit 133‑lpi and 150‑lpi. Check with your print shop for correct screen frequencies.

    • Enter a value for the screen angle in degrees from ‑180 to +180. The screen angle refers to the orientation of the screen. Continuous-tone and black-and-white halftone screens ordinarily use a 45° angle.

    • For Shape, choose the dot shape y'all want.

    The halftone screen becomes function of the image. If you print the image on a halftone printer, the printer will use its own halftone screen too equally the halftone screen that is role of the image. On some printers, the effect is a moiré pattern.

    Custom Pattern

    Simulates the advent of a custom halftone screen in the converted image. Choose a pattern that lends itself to thickness variations, typically one with a diverseness of greyness shades.

    To use this option, you lot first define a design then screen the grayscale prototype to utilise the texture. To encompass the entire image, the pattern must be every bit large as the image. Otherwise, the pattern is tiled. Photoshop comes with several cocky-tiling patterns that can be used as halftone screen patterns.

    To prepare a black-and-white blueprint for conversion, outset convert the image to grayscale and and then apply the Blur More filter several times. This blurring technique creates thick lines tapering from dark grey to white.

    Photoshop convert image to bitmap mode

    Original grayscale image, and 50% Threshold conversion method

    Photoshop Pattern Dither conversion method

    Pattern Dither conversion method, and Diffusion Dither conversion method

Convert a color photo to Grayscale mode

  1. Open the photo you desire to catechumen to black-and-white.

  2. Choose Paradigm > Style > Grayscale.

  3. Click Discard. Photoshop converts the colors in the paradigm to black, white, and shades of gray.

    The technique above minimizes file size simply discards colour data and can convert side by side colors to the verbal same shade of greyness. Using a Blackness & White adjustment layer increases file size but retains color information, letting y'all map colors to shades of grey.

Convert a Bitmap mode image to Grayscale style

You lot tin convert a Bitmap style image to Grayscale way in order to edit it. Go on in mind that a Bitmap style prototype edited in Grayscale style may not look the same when yous catechumen it back to Bitmap mode. For instance, suppose a pixel that is black in Bitmap mode is edited to a shade of gray in Grayscale fashion. When the image is converted dorsum to Bitmap style, that pixel is rendered as white if its grayness value is above the middle gray value of 128.

  1. Choose Image > Mode > Grayscale.

  2. Enter a value betwixt 1 and 16 for the size ratio.

    The size ratio is the factor for scaling downwards the image. For case, to reduce a grayscale prototype past fifty%, enter ii for the size ratio. If you enter a number greater than i, the programme averages multiple pixels in the Bitmap style image to produce a single pixel in the grayscale image. This process lets you generate multiple shades of gray from an image scanned on a ane‑bit scanner.

Convert a grayscale or RGB image to indexed colour

Converting to indexed color reduces the number of colors in the image to at most 256—the standard number of colors supported by the GIF and PNG‑viii formats and many multimedia applications. This conversion reduces file size by deleting colour information from the image.

To catechumen to indexed color, you must start with an image that is 8 bits per channel and in either Grayscale or RGB mode.

  1. Cull Image > Mode > Indexed Color.

    All visible layers will be flattened; any subconscious layers will be discarded.

    For grayscale images, the conversion happens automatically. For RGB images, the Indexed Color dialog box appears.

  2. Select Preview in the Indexed Color dialog box to brandish a preview of the changes.

  3. Specify conversion options.

Conversion options for indexed-color images

When converting an RGB paradigm to indexed color, yous can specify a number of conversion options in the Indexed Color dialog box.

Palette Type

A number of palette types are available for converting an prototype to indexed color. For the Perceptual, Selective, and Adaptive options, you lot can cull using a local palette based on the current paradigm'southward colors. These are the available palette types:

Exact

Creates a palette using the exact colors appearing in the RGB image—an pick bachelor only if the image uses 256 or fewer colors. Because the image's palette contains all colors in the image, there is no dithering.

Arrangement (Mac OS)

Uses the Mac OS default viii‑scrap palette, which is based on a uniform sampling of RGB colors.

Arrangement (Windows)

Uses the Windows system'due south default 8‑scrap palette, which is based on a uniform sampling of RGB colors.

Spider web

Uses the 216-color palette that web browsers, regardless of platform, use to display images on a monitor limited to 256 colors. This palette is a subset of the Mac OS 8‑bit palette. Apply this option to avoid browser dither when viewing images on a monitor brandish express to 256 colors.

Uniform

Creates a palette by uniformly sampling colors from the RGB color cube. For example, if Photoshop takes six evenly-spaced colour levels each of red, greenish, and bluish, the combination produces a uniform palette of 216 colors (6 cubed = 6 10 6 10 half-dozen = 216). The total number of colors displayed in an prototype corresponds to the nearest perfect cube (viii, 27, 64, 125, or 216) that is less than the value in the Colors text box.

Local (Perceptual)

Creates a custom palette past giving priority to colors for which the human eye has greater sensitivity.

Local (Selective)

Creates a color table similar to the Perceptual colour tabular array, but favoring broad areas of colour and the preservation of spider web colors. This option commonly produces images with the greatest color integrity.

Local (Adaptive)

Creates a palette by sampling the colors from the spectrum actualization most commonly in the image. For example, an RGB image with only the colors green and blue produces a palette fabricated primarily of greens and blues. Most images concentrate colors in particular areas of the spectrum. To control a palette more precisely, get-go select a part of the image containing the colors you desire to emphasize. Photoshop weights the conversion toward these colors.

Main (Perceptual)

Creates a custom palette past giving priority to colors for which the man centre has greater sensitivity. Applies when you have multiple documents open; takes all open up documents into account.

Master (Selective)

Creates a color table similar to the Perceptual color table, but favoring wide areas of color and the preservation of web colors. This selection usually produces images with the greatest colour integrity. Applies when you have multiple documents open; takes all open documents into account.

Chief (Adaptive)

Creates a palette by sampling the colors from the spectrum appearing well-nigh commonly in the prototype. For example, an RGB epitome with but the colors green and blueish produces a palette made primarily of greens and blues. Nearly images concentrate colors in particular areas of the spectrum. To control a palette more precisely, first select a part of the image containing the colors you want to emphasize. Photoshop weights the conversion toward these colors. Applies when you have multiple documents open; takes all open up documents into account.

Custom

Creates a custom palette using the Colour Tabular array dialog box. Either edit the color table and salvage it for later use or click Load to load a previously created colour table. This selection also displays the current Adaptive palette, which is useful for previewing the colors most often used in the image.

Previous

Uses the custom palette from the previous conversion, making it easy to catechumen several images with the same custom palette.

Number Of Colors

For the Uniform, Perceptual, Selective, or Adaptive palette, y'all can specify the exact number of colors to be displayed (upward to 256) past entering a value for Colors. The Colors text box controls only how the indexed color table is created. Adobe Photoshop still treats the image as an 8‑flake, 256‑color image.

Colour Inclusion And Transparency

To specify colors to exist included in the indexed colour table or to specify transparency in the prototype, choose from the following options:

Forced

Provides options to forcefulness the inclusion of certain colors in the color table. Black And White adds a pure blackness and a pure white to the colour table; Primaries adds cherry-red, green, blue, cyan, magenta, yellow, black, and white; Web adds the 216 web‑safe colors; and Custom lets you define custom colors to add.

Transparency

Specifies whether to preserve transparent areas of the image during conversion. Selecting this option adds a special index entry in the colour table for transparent colors. Deselecting this option fills transparent areas with the matte color, or with white if no matte color is chosen.

Matte

Specifies the background color used to fill up anti-aliased edges that lie adjacent to transparent areas of the image. When Transparency is selected, the matte is practical to edge areas to help blend the edges with a web background of the same color. When Transparency is deselected, the matte is applied to transparent areas. Choosing None for the matte creates hard-edged transparency if Transparency is selected; otherwise, all transparent areas are filled with 100% white. The paradigm must have transparency for the Matte options to be available.

Dithering

Unless you lot're using the Verbal color tabular array option, the colour table may not contain all the colors used in the image. To simulate colors non in the color table, you can dither the colors. Dithering mixes the pixels of the bachelor colors to simulate the missing colors. Cull a dither choice from the carte du jour, and enter a per centum value for the dither amount. A higher corporeality dithers more than colors but may increase file size. You can choose from the following dither options:

None

Does not dither colors simply instead uses the color closest to the missing color. This tends to result in sharp transitions between shades of colour in the image, creating a posterized effect.

Improvidence

Uses an error-improvidence method that produces a less-structured dither than the Pattern selection. To protect colors in the paradigm that incorporate entries in the color table from being dithered, select Preserve Exact Colors. This is useful for preserving fine lines and text for web images.

Blueprint

Uses a halftone-like square pattern to simulate whatever colors not in the color tabular array.

Noise

Helps to reduce seam patterns along the edges of image slices. Cull this choice if y'all plan to piece the image for placement in an HTML table.

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Source: https://helpx.adobe.com/photoshop/using/converting-color-modes.html

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