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See also: Will my transparent images display correctly?
For some reason Adobe Digital Editions doesn't like some GIF files; it can be temperamental about GIFs. You can cause the GIFs to be converted to PNG when creating an ebook by setting the configuration option Convert images to JPEG to "All, converting GIF to PNG". This will preserve transparency.
Or, to convert each image manually, do this:
click on the image in Jutoh, and export it to a file;
convert it to a PNG in file conversion or photo touchup software such as Paint.Net;
import the PNG into the Jutoh image via image properties and check "Preserve original format".
This should now work, as PNG rendering is more reliable in ADE.
Similarly, some JPEGs will not be displayed in ADE. The problem could be that the images are too large; in this case you can set the configuration option Maximum image width to a value such as 1000 to cause Jutoh to resize the images when creating the ebook. The original size will be retained in the Jutoh project. This also applies to PNG images that Jutoh is converting to JPEG automatically.
Another reason could be that the format does not agree with ADE (32-bit JPEGs might be the problem; 24-bit images are more usual). So, import your images as PNG files via image properties and let Jutoh create JPEGs from them.
An easy way to do this is first copy the image to the clipboard (right-click over the image and choose Copy). Then right-click again, choose Properties, and click Paste. Since pasting always uses the PNG format to preserve quality, it will convert the image to PNG. When the ebook is created, Jutoh will convert the image to JPEG (the default) or preserve it as PNG according to configuration settings.
An even easier way is to force Jutoh to recreate JPEG images when compiling the ebook. If you have large images already, you can limit the image sizes via Maximum image width. Or, set Convert images to JPEG to "All except GIF, recompressing JPEG" which will retain the image size but give it the specified Image quality value.
Either way will generate new 24-bit JPEGs from the original images which is often enough to make them work in ADE.
Contents | Start | End | Previous: KB0107: On Linux, I get 'Sorry, the existing instance of Jutoh may be too busy too respond' | Next: KB0109: How do I specify popup footnotes for Apple Books?