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 Forum index » Advanced Topics » Additional Software (PETs, n' stuff) » Graphics
Convert png picture to jpg in command line [SOLVED]
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Argolance


Joined: 06 Jan 2008
Posts: 3255
Location: PORT-BRILLET (Mayenne - France)
PostPosted: Tue 14 Aug 2012, 09:33    Post subject:  Convert png picture to jpg in command line [SOLVED]  
Hello,
Does any very small and autonomous script exist, already present (or not!) on Puppy (as "resizepng" for example!) that would convert png pictures to jpg (something like "png2jpg")? Where could I find this?

Cordialement.
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Last edited by Argolance on Wed 15 Aug 2012, 12:38; edited 1 time in total
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rcrsn51


Joined: 05 Sep 2006
Posts: 11889
Location: Stratford, Ontario
PostPosted: Tue 14 Aug 2012, 09:51    Post subject:  
Code:
pngtopnm xxx.png | pnmtojpeg > xxx.jpg

Or as a script named "png2jpg":
Code:
#!/bin/sh
pngtopnm $1 | pnmtojpeg > ${1%.*}.jpg

Or if your filenames may contain spaces:
Code:
#!/bin/sh
pngtopnm "$1" | pnmtojpeg > "${1%.*}.jpg"
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Argolance


Joined: 06 Jan 2008
Posts: 3255
Location: PORT-BRILLET (Mayenne - France)
PostPosted: Tue 14 Aug 2012, 12:44    Post subject:  
Hello rcrsn51,
Thank you! Very Happy
I know this is not the place to ask this question but:
I didn't succeed in making several commands one after the other with scrot...
Quote:
Usage : scrot [OPTIONS]... [FILE]
Where FILE is the target file for the screenshot.
If FILE is not specified, a date-stamped file will be dropped in the
current directory.
See man scrot for more details
-h, --help display this help and exit
-v, --version output version information and exit
-b, --border When selecting a window, grab wm border too
-c, --count show a countdown before taking the shot
-d, --delay NUM wait NUM seconds before taking a shot
-e, --exec APP run APP on the resulting screenshot
-q, --quality NUM Image quality (1-100) high value means
high size, low compression. Default: 75.
For lossless compression formats, like png,
low quality means high compression.
-m, --multidisp For multiple heads, grab shot from each
and join them together.
-s, --select interactively choose a window or rectnagle
with the mouse
-t, --thumb NUM generate thumbnail too. NUM is the percentage
of the original size for the thumbnail to be,
or the geometry in percent, e.g. 50x60 or 80x20.

SPECIAL STRINGS
Both the --exec and filename parameters can take format specifiers
that are expanded by scrot when encountered.
There are two types of format specifier. Characters preceded by a '%'
are interpretted by strftime(2). See man strftime for examples.
These options may be used to refer to the current date and time.
The second kind are internal to scrot and are prefixed by '$'
The following specifiers are recognised:
$f image path/filename (ignored when used in the filename)
$m thumbnail path/filename
$n image name (ignored when used in the filename)
$s image size (bytes) (ignored when used in the filename)
$p image pixel size
$w image width
$h image height
$t image format
$$ prints a literal '$'
\n prints a newline (ignored when used in the filename)
Example:
scrot '%Y-%m-%d_$wx$h_scrot.png' -e 'mv $f ~/images/shots/'
Creates a file called something like 2000-10-30_2560x1024_scrot.png
and moves it to your images directory.

How could this be done? i. e. get a picture, give it defined height and width in pixels then save it in a directory as jpg file, all in the same command line...
Any idea?
Thank you!

Cordialement!
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Karl Godt


Joined: 20 Jun 2010
Posts: 4208
Location: Kiel,Germany
PostPosted: Tue 14 Aug 2012, 13:33    Post subject:  
scrot is patched by ubuntu . At least one option is not in the original source code iirc.
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Jasper

Joined: 25 Apr 2010
Posts: 1350
Location: England
PostPosted: Tue 14 Aug 2012, 13:55    Post subject:  
Hi Argolance,

If you haven't seen PupSnap find any post by radky and click on his PupMates, signature and scroll down to PupSnap 1.8. It's superb and may be of huge interest to you.

My regards
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rcrsn51


Joined: 05 Sep 2006
Posts: 11889
Location: Stratford, Ontario
PostPosted: Tue 14 Aug 2012, 16:27    Post subject:  
Argolance wrote:
How could this be done? i. e. get a picture, give it defined height and width in pixels then save it in a directory as jpg file, all in the same command line...

Try this
Code:
#!/bin/sh
pngtopnm "$1" | pnmscale -width $2 -height $3 | pnmtojpeg > "${1%.*}.jpg"
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Argolance


Joined: 06 Jan 2008
Posts: 3255
Location: PORT-BRILLET (Mayenne - France)
PostPosted: Wed 15 Aug 2012, 05:29    Post subject:  
Hello,
@Jasper
Quote:
If you haven't seen PupSnap find any post by radky and click on his PupMates, signature and scroll down to PupSnap 1.8. It's superb and may be of huge interest to you.
... Sorry but it is not what I am looking for: I made a very similar script for Toutou LINUX (French version of Puppy) and posted it in the Forum => Easyshot

I would like a single scrot command line working quietly inside an other script.Till now, I saved the "scrot" picture somewhere then, using several different scripts, reduced, converted, renamed and moved this image to a specific directory (and this was first the reason of this thread!). But, looking at the help file of "scrot" (please see above), it seems possible to do this at one time, directly with the "scrot" options but I guess I don't know how to build this command for scrot to execute all the options inside a single line...
I think this question should/could be solved and very useful...

@rcrsn51
This is interesting because scrot can make pictures directly in pnm format. Your command line suits me and it will be enough for me!
Thank you!
Just a last question: "$1" => picture name? $2 and $3 => width/height in pixels?

Cordialement.
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stu91


Joined: 06 Aug 2012
Posts: 145
Location: England. Dpup. Dell Inspiron 1501
PostPosted: Wed 15 Aug 2012, 06:53    Post subject:  
Hi Argolance,
I dont think you can directly specify resolution for scrots main screen capture - you need to take the main capture then scale it to size with the -t thumb nail option - then remove rm $f main capture and move thunbnail mv $m to main file name $f.
try:

Code:
scrot -t 640x400 '/root/test.jpg' -e 'rm $f && mv $m $f'


or

Code:
scrot -t 50%  '/root/test.jpg' -e 'rm $f && mv $m $f'
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Argolance


Joined: 06 Jan 2008
Posts: 3255
Location: PORT-BRILLET (Mayenne - France)
PostPosted: Wed 15 Aug 2012, 12:37    Post subject:  
Hello stu91,
This looks (a little bit!) like what I did, using pnm commands:
Code:
   scrot 'theme_shot_tmp.pnm' -e 'mv $f /tmp/'
   pnmscale '/tmp/theme_shot_tmp.pnm' -width 600 -height 375 | pnmtojpeg  > '/tmp/theme_shot_tmp.jpg'
   mv -f /tmp/theme_shot_tmp.jpg /root/.jwm/themes/themes_pictures/"${THEME_NAME_}_perso.jpg"

Thank you very much to all of you!
This Forum is "fantastic"!

Cordialement.
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MU


Joined: 24 Aug 2005
Posts: 13648
Location: Karlsruhe, Germany
PostPosted: Mon 20 Aug 2012, 18:42    Post subject:  
scale2pic:
http://murga-linux.com/puppy/viewtopic.php?t=29184

Mark
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rcrsn51


Joined: 05 Sep 2006
Posts: 11889
Location: Stratford, Ontario
PostPosted: Tue 21 Aug 2012, 11:27    Post subject:  
A GUI version of scale2pic is here.
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Argolance


Joined: 06 Jan 2008
Posts: 3255
Location: PORT-BRILLET (Mayenne - France)
PostPosted: Tue 21 Aug 2012, 13:36    Post subject:  
Thanks...
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