Solution for "A Graphics Object cannot be Created from an Image that has an Indexed Pixel Format"
In this article, you can learn how to avoid the issues/errors when you access/edit indexed pixel format images using few steps.
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Jun 18, 2011
If you override the image that has this problem, and explicitly save it as a 32 bit-depth colors (explicitly), the problem is gone too. Apparently this problem occurs if an image has a relatively low amount of used colors. In that case when storing the image as 'auto detect color-depth) it will persist in a lower amount which conflicts ... downside: size of images are somewhat bigger.