[PD] Reading a specific image from [pix_buffer] and saving it using [pix_write]

[Seiichiro MATSUMURA]

Hi IOhannes,

Thanks for your quick reply.

> i'm pretty suzre, that the resolution of the image does not change,
> even on OSX.
> with chnaged "color space", do you mean that the colors are stored in
> the wrong order? or do you mean that your YUV pix ends up as an ARGB
> image?

The attached picture named "test.jpg" is what I saved using the
attached patch. The original pict in a buffer is like right hand side
of another attached picture "screenshot_gemwin.jpg". Somehow colors
are changed, the width become half and a picture itself is doubled.
This is what I meant changing "color space" and "resolution".
Is this not happening on your OSX?
With my machine, this phenomena happens not only on OSX lion but also
10.6.8 Snow Leopard.

> are you only told that it is CPU-consumptive, or do you experience any
> actual problems?

In my case this time, I don't face the CPU-consumptive problem yet,
because I need to play back and save only 16 frimes from buffers of
pix_buffer.
Your suggestion patch is one of solutions if I only save few specific frames.
However in my another future project, I would like to record longer
movie from pix_video and save all frames, it would be more than 1000
to 2000 frames.
I am just wondering it would work fine with [pix_rgba] conversion
beside regarding the help file description and the past articles on ML
as;
http://lists.puredata.info/pipermail/gem-dev/2009-03/003895.html

> so, which version of Gem are you using?

I am using GEM: ver: 0.92.3.

> which image-writing backends are installed (Gem should printout
> something like "Image saving support: QuickTime")

The printout should be come out on Pd window? There is no printout
when saving a frame of pix_buffer. How can I get it?


Cheers,

Sei

--
__/__/__/__/__/__/__/__/__/__/__/__/__/__/__/__/__/
Seiichiro Matsumura

sei at low-tech-ism.com
http://low-tech-ism.com/
__/__/__/__/__/__/__/__/__/__/__/__/__/__/__/__/__/


2012/7/10 IOhannes m zmoelnig <zmoelnig at iem.at>:
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>
> On 2012-07-10 05:53, Seiichiro MATSUMURA wrote:
>> Hi,
>>
>> I try to do the similar thing, capturing from pix_video, saving a
>> specific frame of [pix_buffer] to jpg files. However, the color
>> space and the resolution of saved jpg file is changed. Even saving
>> tiff is the same result.
>
> i'm pretty suzre, that the resolution of the image does not change,
> even on OSX.
> with chnaged "color space", do you mean that the colors are stored in
> the wrong order? or do you mean that your YUV pix ends up as an ARGB
> image?
> the latter is not a bug, the former is.
>
>> I know one of the ways is converting Gemlist from YUV to RGBA
>> using [pix_rgba] before inputing [pix_buffer_write], but it is
>> told "CPU-consumptive".
>
> are you only told that it is CPU-consumptive, or do you experience any
> actual problems?
>
> if the conversion is indeed too CPU intensive and you only take
> snapshots every now and then (not every frame), you could put the
> [pix_rgba] in a branch that is only executed when needed.
>
> e.g.
>
> gemlist
> |       [r spigot]
> |       |
> [spigot ]
> |
> [t a b]
> |     |
> |     [; spigiot 0(
> |
> [pix_rgba]
> |                    [r writer]
> |                    |
> [pix_buffer_write foo]
> |
> [save /tmp/foo.jpg 0(
> |
> [pix__buffer foo[
>
> and click this to capture an image:
>  [; spigot 1; writer 0(
>
>
>> So, is there any solutions to save YUV data in pix_buffer directly
>> to jpg file with keeping colorspace and resolution. I am using Mac
>> OS 10.7.4 and pd-extended 0.42.5.
>
> sorry, i cannot keep track of all the various distributions of Gem.
>
> so, which version of Gem are you using?
> which image-writing backends are installed (Gem should printout
> something like "Image saving support: QuickTime")
>
> mfgds
> IOhannes
>
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