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On a computer the keyboard or number pad can also be used. Tap or click the button corresponding to which shape you see. Look for a shape, such as a number or symbol, which is embedded within the dot pattern. You will see a series of images composed of dots with varying size and lightness. Depending on which colors are seen, the type and extent of color vision deficiency can be estimated. When a person has color blindness, they are able to see some colors better than others. By testing with different colors we are able to understand which colors you may have difficulty seeing.
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It is merely posted for additional information.This test measures your ability to see a pattern based on its color. I have no affiliation with the link above. It's really best to preflight production PDFs using Acrobat, as opposed to preflighting layout files using InDesign. Be aware though, even if you preflight in InDesign, the PDF Job Options used when exporting to a PDF can alter things. This can be helpful to determine issues before you ever get to the PDF. Note: If you are using Adobe InDesign you can preflight with InDesign. Similar to needing InDesign to create professional-level layouts, print production often needs Acrobat Pro for some professional-level tasks. If you don't have Acrobat Pro and are creating PDFs destined for commercial printing, you need Acrobat Pro. Below shows a non-compliant PDF containing RGB data on the left and a compliant PDF on the right. Once you run the compliance test, you can see easily if there is any RGB data and on what page of the PDF it is located. You can use any of the options in the green box below to simply verify compliance with PDFX standards, which requires no RGB data to be compliant. With a PDF open, choose View > Tools > Print Production > Preflight from the menu.
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Things should be very similar in newer versions of Acrobat. I'm using Acrobat Pro X here, merely because I prefer that version. Another way if you prefer to have the data determined without visually needing to verify anything is to use Preflight in Acrobat.
![Color test print pdf](https://cdn2.cdnme.se/5447227/9-3/18_64e61dfc9606ee7f722fb462.png)