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

[Alvin Wong]

Is that needed? I would imagine whatever plugins or programs would
already have known the absolute size they want in pixels, independent
of the dpi, and could just automatically take the closest thumbnail or
the mergedimage and scale it down accordingly.

Perhaps you can also add a thumbnail of size 2048x2048 but I wonder
how much it would add to the file size...

By the way I remember seeing in the Krita git repo some scripts which
look like plugins for certain programs to extract the thumbnail, but I
can't seem to find them now. Does anyone know, other than the Windows
shell extension, what other file managers or programs currently
supports extracting thumbnails from Krita files/

Best Regards,

Alvin


2016-06-06 14:54 GMT+08:00 Boudewijn Rempt <boud at valdyas.org>:
> 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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>> kimageshop at kde.org
>> https://mail.kde.org/mailman/listinfo/kimageshop
>
>
> --
> Boudewijn Rempt | http://www.krita.org, http://www.valdyas.org
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