Also set one dimension to a percent and the other to auto unless it's a very small image (maybe 300 px wide max?), in which case absolute pixels.
There is probably a maximum size limitation due to RAM? But I've not seen that happen on my ancient PRS350 or Kindle DXG. Certainly the DX and DXG had a stupidly low amount of RAM for the target application of Education.
I don't grok their GoK.
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