An image is said to be in indexed color mode if it uses a limited palette of colors. The number of colors in an indexed color image is typically 256 or fewer.
When an image is in this mode, each pixel is given a number (or index) that corresponds to a specific color in the palette. Indexed color images are usually used for GIFs and web graphics.
The advantage of using an indexed color image is that the file size is usually smaller than if the image were in RGB mode. The downside is that there are fewer colors to work with, so the image may not look as good as it could.
PRO TIP: When working with indexed color in Photoshop, it is important to remember that this color mode only supports a limited number of colors. This can cause problems when trying to print or display your images on devices that use more colors. Indexed color also doesn’t support transparency, so it’s not a good choice for images that need to be layered or composited.
If you’re working with an indexed color image in Photoshop, there are a few things to keep in mind. First, you’ll want to make sure that you’re using the right color mode for the project you’re working on. If you’re not sure, ask your client or boss what they prefer. Second, when editing an indexed color image, it’s important not to change the number of colors in the image.
Doing so can cause banding and other artifacts. Finally, remember that you can always convert an indexed color image to RGB or CMYK if you need more colors.
conclusion
Indexed color images are best used for GIFs and web graphics because they offer a smaller file size without compromising too much quality. When working with an indexed color image, be aware of the limitations to avoid any unwanted artifacts.
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