I've tried another tool to trim margins and ONLY downscale when needed. The resulting chapter looks fine on the voyage, albeit it depends on the kindle viewer to upscale the images. My preference is to not have the images externally upscaled, so to greatly reduce storage requirements, and have the device perform the scaling since it seems fast enough to do so.
Will you be allowing for that choice by adding the option to not add margins to non-upscaled images? I wonder if this option would be even less work for the kindle since it would just need to upscale the image instead of first finding/cropping-out the margins and then perform the upscaling.
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Found the cause. When ALL images are smaller than screen resolution then no page have any Panel View data. In this case Kindle force virtual Panel View even if MOBI header is set to use real Panel View. And that cause this entire anomaly. I will fix it in next release.
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Please note that the cover page is usually larger than the screen resolution, but I guess that doesn't matter since your app splits the landscape image to two smaller images.
Thanks for looking into this!