What are the current guidelines for images intended to be full-page illustrations?
Image position: The source document has the images float so they take up the page after their insertion point. I’m not finding any clues how to accomplish this in EPUB, and I’m rather suspecting it isn’t possible (and certainly not in MOBI/KF7 conversion), so how have folk here handled this? (Unless I get a better suggestion, I’m going to ask the author’s approval to move each of the images to the end of their respective chapters.)
Image color: The images are scanned gray-scale line-art. (I was originally given JPEGs (!), but I’ve since received PSD files.) I understand that gray-scale PNG is the best format for this, but should I leave it as black & gray on white, or convert to transparent? On one hand, for readers like myself who prefer to set the background color away from white, a transparent background would be cleaner; on the other hand, some users might have set a reverse color theme. On the gripping hand, perhaps some e-readers choke on transparent PNGs? I’ve never seen PNGs used with transparent backgrounds, and I’m wondering why.
Image resolution: The image resolution is ridiculously high: 5921×7008 in one case; and I’ve already seen some e-readers choke on that. (Besides, this will make the download file far bigger than it needs to be.) Is there a recommended resolution which will work on most EPUB readers while still displaying sharply on Kindles?
Code: Is there any reason to use the SVG wrapper I’ve seen some recommendations for? Is there any CSS I should look for beyond text-align: center; height: 100%;? (ETA: Kindlegen tells me that my initial CSS, which included max-height: 100%; max-width: 100%;, is not supported, so I’m looking for a more portable option.)
Image position: The source document has the images float so they take up the page after their insertion point. I’m not finding any clues how to accomplish this in EPUB, and I’m rather suspecting it isn’t possible (and certainly not in MOBI/KF7 conversion), so how have folk here handled this? (Unless I get a better suggestion, I’m going to ask the author’s approval to move each of the images to the end of their respective chapters.)
Image color: The images are scanned gray-scale line-art. (I was originally given JPEGs (!), but I’ve since received PSD files.) I understand that gray-scale PNG is the best format for this, but should I leave it as black & gray on white, or convert to transparent? On one hand, for readers like myself who prefer to set the background color away from white, a transparent background would be cleaner; on the other hand, some users might have set a reverse color theme. On the gripping hand, perhaps some e-readers choke on transparent PNGs? I’ve never seen PNGs used with transparent backgrounds, and I’m wondering why.
Image resolution: The image resolution is ridiculously high: 5921×7008 in one case; and I’ve already seen some e-readers choke on that. (Besides, this will make the download file far bigger than it needs to be.) Is there a recommended resolution which will work on most EPUB readers while still displaying sharply on Kindles?
Code: Is there any reason to use the SVG wrapper I’ve seen some recommendations for? Is there any CSS I should look for beyond text-align: center; height: 100%;? (ETA: Kindlegen tells me that my initial CSS, which included max-height: 100%; max-width: 100%;, is not supported, so I’m looking for a more portable option.)