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Old 07-24-2014, 09:14 AM   #29
chaley
Grand Sorcerer
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Posts: 12,495
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Join Date: Jan 2010
Location: Notts, England
Device: Kobo Libra 2
Quote:
Originally Posted by jackie_w View Post
Also a consideration for a future release. On my Samsung Galaxy TabPRO even the 'Large' Book Details cover size is only 4.5x3cm because the screen resolution is, 2560x1600. As more tablets get the higher res screens perhaps an extra-large option may be popular.
There be a few dragons here.

CC doesn't have the original cover defined in calibre. Instead it has a computed thumbnail, 320x320 maintaining aspect ratio. We can certainly increase the amount of screen real estate taken by the displayed image, but that could easily pixelate. For example, in portrait I can imagine you wanting the cover in a 600x600 box. Lets call that 640x640, which means that every cover image pixel is expanded to 4 displayed pixels. I don't know if this is acceptable. If the displayed PPI is very large than it probably wouldn't matter.

The alternative is to increase the size of the downloaded thumbnail. The upside is a nicer picture. The downside is substantially longer download times and substantially more memory (database) use. In addition, every cover would be downloaded on the next wireless connect any time the preference was changed. I am very reluctant to go down this road.

A third alternative is a variant of the first: pick a "standard" PPI, perhaps for example that of the original N7/N10, and scale the cover image so that the physical space consumed on higher density devices is the same as on the "standard" device. This might be the right choice, but unfortunately I have no way to test it because I don't own a high-density device. There is also the potential problem of pixelation.

I am not sure what the right approach is.
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