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Color coating on images, and "pdf" files


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When I open a pdf or image file, a color overlay is created on the images and files as below. It can be temporarily resolved by enlarging or shrinking the image, but re-creating it. What is the problem and how should I fix it. The specifications of my system are as follows:

System: Dell Optiplex 780

CPU: INTEL Core2 Dual Q9550

GPU: ATI Radeon HD 5040 1024 MB

OS: MacOs High Sierra 10.13.6



Edited by teseh
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