The issue is reproducible only on Windows XP. On newer versions of windows, the images are rendered as expected. WORKAROUND: You may try implementing custom filter that handles the CMYK scenario. How to implement custom DCTDecode filter is described in this documentation article: https://docs.telerik.com/devtools/winforms/pdfviewer/customize-and-extensibility/customize-pdf-rendering
The OS is out of support and the required minimal .Net Framework version is not supported on Windows XP. Additional info: https://devblogs.microsoft.com/dotnet/p/dotnet45xp/
Regards, Dimitar Stoyanov Progress Telerik
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