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List: kde-kimageshop
Subject: Re: Artists, which colorspaces do you use and why?
From: David Revoy <davidrevoy () gmail ! com>
Date: 2013-04-21 18:49:26
Message-ID: CAPX1LSDYszNA6L+w0fLSQrkE9T++4Yxj3=z2ZSJ8KfPYqzLy=Q () mail ! gmail ! com
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Hi Lukas,
Always cool to have Krita&G'mic news ;-)
I think you already know what I use : mainly 8-bit RGBA to keep
compatibility with *.ora saving and so, other software ( and also
Artscriptk with calligraconverter for my client's preview jpg and various
web export ).
I also use CMYK but at the end of an artwork, to convert, correct and
manage what ink pass will affect my colors from printing machine ( cleaning
colors ).
I don't think I expect to apply Gmic filter at this late step. But I admit
a Gmic filter as in Color>Mixer[CMYK] ( http://i.imgur.com/d8KVmP2.jpg ) or
any other color correction filters could add a bit more of CMYK control and
fun to this step.
-David
__________________
http://www.davidrevoy.com
2013/4/21 Lukast dev <lukast.dev@gmail.com>
> Hello guys,
>
> yesterday I was working futher on GMIC integration and I have few
> first performance numbers!
>
> Converting 8-bit RGBA image to 32-bit float RGBA colorspace takes
> around 1.7-2.0 seconds
> for 1294x1674 image (KisPaintDevice::convertTo).
>
> We could probably hide this conversion somewhere in background
> before the filter dialog will be shown though, but we can't hide it on
> output.
>
> Poster edges took 5.5 seconds on that same image.
>
> At the end on output I did not convert the layer back from Float32 to
> 8-bit RGBA.
> That will took probably another 2 seconds.
>
> That's quite slow experience and we will have to address this problem.
>
> If I imagine that artists sometimes wants to filter multi-layer picture,
> then
> 1.) we need strokes for filters!
> 2.) try to avoid conversions
> o gmic can work in 8-bit only for some filters
> o advice krita users to work in float32 color-space?
>
> That's why I'm wondering on forum [1] what artists are using?
> To find out If this conversion is problem or not..
>
> Cheers
> Lukas
>
> [1] http://forum.kde.org/viewtopic.php?f=137&t=110914
> _______________________________________________
> Krita mailing list
> kimageshop@kde.org
> https://mail.kde.org/mailman/listinfo/kimageshop
>
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Hi Lukas, <br>Always cool to have Krita&G'mic news ;-)<br>I think you already \
know what I use : mainly 8-bit RGBA to keep compatibility with *.ora saving and so, \
other software ( and also Artscriptk with calligraconverter for my client's \
preview jpg and various web export ). <br> I also use CMYK but at the end of an \
artwork, to convert, correct and manage what ink pass will affect my colors from \
printing machine ( cleaning colors ). <br>I don't think I expect to apply Gmic \
filter at this late step. But I admit a Gmic filter as in Color>Mixer[CMYK] ( <a \
href="http://i.imgur.com/d8KVmP2.jpg">http://i.imgur.com/d8KVmP2.jpg</a> ) or any \
other color correction filters could add a bit more of CMYK control and fun to this \
step.<br>
-David<span style="color:rgb(192,192,192)"><br>__________________</span><br><div><font \
size="1"><a href="http://www.davidrevoy.com" \
target="_blank">http://www.davidrevoy.com</a></font><br></div> <br><br><div \
class="gmail_quote">2013/4/21 Lukast dev <span dir="ltr"><<a \
href="mailto:lukast.dev@gmail.com" \
target="_blank">lukast.dev@gmail.com</a>></span><br><blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"> Hello guys,<br>
<br>
yesterday I was working futher on GMIC integration and I have few<br>
first performance numbers!<br>
<br>
Converting 8-bit RGBA image to 32-bit float RGBA colorspace takes<br>
around 1.7-2.0 seconds<br>
for 1294x1674 image (KisPaintDevice::convertTo).<br>
<br>
We could probably hide this conversion somewhere in background<br>
before the filter dialog will be shown though, but we can't hide it on<br>
output.<br>
<br>
Poster edges took 5.5 seconds on that same image.<br>
<br>
At the end on output I did not convert the layer back from Float32 to<br>
8-bit RGBA.<br>
That will took probably another 2 seconds.<br>
<br>
That's quite slow experience and we will have to address this problem.<br>
<br>
If I imagine that artists sometimes wants to filter multi-layer picture,<br>
then<br>
1.) we need strokes for filters!<br>
2.) try to avoid conversions<br>
o gmic can work in 8-bit only for some filters<br>
o advice krita users to work in float32 color-space?<br>
<br>
That's why I'm wondering on forum [1] what artists are using?<br>
To find out If this conversion is problem or not..<br>
<br>
Cheers<br>
Lukas<br>
<br>
[1] <a href="http://forum.kde.org/viewtopic.php?f=137&t=110914" \
target="_blank">http://forum.kde.org/viewtopic.php?f=137&t=110914</a><br> \
_______________________________________________<br> Krita mailing list<br>
<a href="mailto:kimageshop@kde.org">kimageshop@kde.org</a><br>
<a href="https://mail.kde.org/mailman/listinfo/kimageshop" \
target="_blank">https://mail.kde.org/mailman/listinfo/kimageshop</a><br> \
</blockquote></div><br>
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