About the file size of Default.png

Question

Hallo forum members,
Is there a 2 MB restriction on [email protected]  as there is on normal JPEG pictures?
When I save the [email protected] for a widget the filesize goes up to more than 2 MB, as I save the png with 24 Bit.
Using 8 bit depth to save file size the images show artefacts and color banding.
Ulrike

Answer 1

Book Cover Art
● The book’s cover art that appears on the iBooks Store (also known as the marketing image) is the image
delivered alongside the book asset and does not refer to the cover image included in the book asset. The
pixel limit for the interior cover, as with all interior book images, has been increased to 3.2 million pixels.
● The book’s cover art must use RGB color mode and should be at least 1400 pixels along the shorter axis.
For best results, a good rule of thumb is to use an image that is a minimum of 300 dpi.
● The book’s cover art file must be a high-quality JPEG with .jpg or .jpeg extension or PNG with .png
extension.
● The 3.2 million pixel limit on interior book images does not apply to the external cover/marketing image
that is sent alongside the book asset.
● It is important that you do not increase the size of a smaller image to meet the minimum image size
dimension standard. Excessively blurry or pixelated images will be rejected.
Screenshots
You can provide up to five screenshots per book.
● Full-sized iPad 1/2 images (1024 x 768 or 768 x 1024) in PNG (.png) or JPEG (.jpg) format.
● Full-sized new iPad images (2048 x 1536 or 1536 x 2048) in PNG (.png) or JPEG (.jpg) format.
● For a cleaner look, you can optionally remove the status bar (making the images 1004 x 768 or 748 x 1024
for iPad 1/2, or 2028 x 1536 or 1536 x 2028 for the new iPad).
Perhaps the engineers should take time to read  the Assett guide.  As yet I have not found any engineers posts  advising other than the assett guuide.. do you have a link for any?
Its always better to have higher resolution images  than not, and as long as the end product comes with the 3.2 meg limit for all except the cover, its good for those not over familar with image ediiting.
The iPad retina screen resolution is 2048 x 1536 @164 DPI/PPI