Colorspace Indexed InDesign

Brief Description

Indexed color is a technique to manage digital images' colors in a limited fashion, in order to save computer memory and file storage, while speeding up display refresh and file transfers. It is a form of vector quantization compression.

When an image is encoded in this way, color information is not directly carried by the image pixel data, but is stored in a separate piece of data called a palette: an array of color elements, in which every element, a color, is indexed by its position within the array. The image pixels do not contain the full specification of its color, but only its index in the palette. This technique is sometimes referred as pseudocolor or indirect color, as colors are addressed indirectly.





What your issue is

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How to fix this issue

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More details

For correct printing you need to create your design using CMYK color space (the best way) or convert to the CMYK.

Use the following menu options: Window/Swatches and Window/Color. Double click color in Swatches Change color mode to CMYK and color type to Process. Any colors created in the document that are not in the Swatches palette, need to be changed to the CMYK color space. Select each object you want to convert and make sure the Color palette reflects the CMYK percentages. Click top right arrow in the palette to change to CMYK if necessary.

You can also convert RGB to CMYK at the output stage using the Output tab in the print dialogue box. If you are using PDF export, InDesign can automatically convert RGB to CMYK on some PDF profiles.

References:

Indexed color

Indexed Colors Glossary

Understand How Color Works

Customize indexed color tables