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

[Dmitry Kazakov]

The only trouble I see with thumbnail generation is the speed. It would be
great to see the speen benchmarks of saving a PNG of each size. People are
complaining about Krita saving too slow :( I even heard a wish (during the
KomMissia) to disable any preview and mergedimage.png saving into .kra to
make the saving quicker.




On Mon, Jun 6, 2016 at 3:44 PM, Boudewijn Rempt <boud at valdyas.org> wrote:

> On Mon, 6 Jun 2016, Alvin Wong wrote:
>
> 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.
>>
>
> I don't know... Hidpi and Retina is still really confusing me across the
> board.
>
> 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/
>>
>
> Code for Qt applications is in the kimageformats repo now, I moved
> that some time ago. There are also scripts for nautilus and gnome.
>
>
>
>> 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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>>>
>> _______________________________________________
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>>
>
> --
> Boudewijn Rempt | http://www.krita.org, http://www.valdyas.org
> _______________________________________________
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> kimageshop at kde.org
> https://mail.kde.org/mailman/listinfo/kimageshop
>



-- 
Dmitry Kazakov
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