Proposal: Add thumbnails of different sizes to .kra files?
Boudewijn Rempt
boud at valdyas.org
Mon Jun 6 18:22:44 UTC 2016
On Tue, 7 Jun 2016, Alvin Wong wrote:
> About the mergedimage.png, I see that the png itself isn't compressed
> at all, only compressed by DEFLATE inside the zip container. For a
> completely-transparent image of 3600x2400, the mergedimage.png is 33MB
> uncompressed, which is ridiculous. It's 55KB compressed, much smaller,
> but still a bit larger than expected.
>
> Would compressing the png itself and STORE it inside the zip container
> instead be better? Might want to benchmark and compare.
Oh, yes -- that's a good idea!
>
> 2016-06-07 0:59 GMT+08:00 Boudewijn Rempt <boud at valdyas.org>:
>> On Mon, 6 Jun 2016, Dmitry Kazakov wrote:
>>
>>> 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.
>>
>>
>> Well that needs checking indeed.
>>
>>> 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.
>>
>>
>> That's just flat-out not going to happen.
>>
>>
>>>
>>>
>>>
>>>
>>> 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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>>>
>>>
>>> --
>>> Boudewijn Rempt | http://www.krita.org, http://www.valdyas.org
>>> _______________________________________________
>>> Krita mailing list
>>> kimageshop at kde.org
>>> https://mail.kde.org/mailman/listinfo/kimageshop
>>>
>>>
>>>
>>>
>>> --
>>> Dmitry Kazakov
>>>
>>>
>>
>> --
>> Boudewijn Rempt | http://www.krita.org, http://www.valdyas.org
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--
Boudewijn Rempt | http://www.krita.org, http://www.valdyas.org
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