Proposal: Add thumbnails of different sizes to .kra files?

[Boudewijn Rempt]

I think we can easily do this: but maybe we should at the same time
add thumbnails with a @2 extension to prepare for hidpi and retina
displays?

On Mon, 6 Jun 2016, Alvin Wong wrote:

> Hi,
>
> I would like to suggest Krita add (uncropped) thumbnail images of
> different sizes to the file to allow faster extraction of thumbnails
> by external applications.
>
> There is currently one preview.png which is at maximum 256x256, so
> generating thumbnails larger than that would require scaling down from
> the mergedimage.png which could be very large and may take a
> comparatively long time to process. Even though the actual time per
> file might not be much, it could add up for a lot of files.. Also, the
> preview.png is cropped to the non-transparent region
> (https://bugs.kde.org/show_bug.cgi?id=363968) which makes things a bit
> weird and inconsistent.
>
> I think having thumbnails for the sizes (maintaining aspect ratio) of
> 256x256 and 1024x1024 would suffice, but boud suggested having 512x512
> might be nice too. Adding in these sizes means that, for thumbnails
> equal to or below the available sizes, they can be extracted and
> optionally scaled down from those instead of scaling down from the
> mergedimage.png. Obviously, sizes larger than that would still require
> using the mergedimage.png, but hopefully it would be quite rare for an
> application to request for thumbnails larger than 1024x1024... (4K
> displays aren't popular yet... right?)
>
> For the record, according to this MSDN page
> (https://msdn.microsoft.com/en-us/library/windows/desktop/cc144118(v=vs.85).aspx)
> Windows asks for the sizes 32/96/256/1024.
>
> I am asking for this as the developer of the Windows Shell Extension.
>
> Any suggestions?
>
> Best Regards,
>
> Alvin
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-- 
Boudewijn Rempt | http://www.krita.org, http://www.valdyas.org