Re: image reduction script
Kamilche wrote:
> Be sure and use mode = P instead of RGB, like you have in your other
> code. P is for palettized images. Don't palettize if you're storing as
> JPG, only if you're storing as PNG or some other format that can handle
> 256 color images.
My problem is this:
1) If I use a save to jpg after a convert('P') I get an exception (what you
are refering to I assume)
2) If I use a save to png (I start with a jpg), then the (X,Y) size of the
output is much smaller than convert('RGB') and save to jpg - (and I want to
opposit: as small as possible in byte size and as large as possible in
(X,Y) ):
*** SAME INPUT FILE.JPG ***
***convert('P') save to PNG
/home/philippe/tmp/tmprpdfEO is a 65x87 Raw PPM image with 256 levels
Default gamma for ITRUE image is 1.00
Building XImage...done
Have adjusted image from 1.00 to display gamma of 2.20
Versus:
***convert('RGB') save to JPG
/home/philippe/tmp/tmpYCLrQR is a 173x231 Raw PPM image with 256 levels
Default gamma for ITRUE image is 1.00
Building XImage...done
Have adjusted image from 1.00 to display gamma of 2.20
Philippe
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Re: image reduction script
Be sure and use mode = P instead of RGB, like you have in your other code. P is for palettized images. Don't palettize if you're storing as JPG, only if you're storing as PNG or some other format that can handle 256 color images. -- http://mail.python.org/mailman/listinfo/python-list
Re: image reduction script
Kamilche, I am posting the code in another thread but am not certain that convert does anything to the picture color depth ... still searching in the doc. Philippe Kamilche wrote: > > To reduce the color depth of an image in PIL: > im = im.convert(mode="P", palette=Image.ADAPTIVE) -- http://mail.python.org/mailman/listinfo/python-list
Re: image reduction script
Thanks, I'll give it a shot. Philippe Kamilche wrote: > > To reduce the color depth of an image in PIL: > im = im.convert(mode="P", palette=Image.ADAPTIVE) -- http://mail.python.org/mailman/listinfo/python-list
Re: image reduction script
To reduce the color depth of an image in PIL: im = im.convert(mode="P", palette=Image.ADAPTIVE) -- http://mail.python.org/mailman/listinfo/python-list
Re: image reduction script
Larry, I actually did not find what I needed in PIL (missed it ?) but found this package quite usefull: http://www.imagemagick.org/script/index.php Philippe Larry Bates wrote: > Philippe Martin wrote: >> Hi, >> >> I need to write a script to reduce the resolution/color depth of an image >> (ex: .jpg) based on a target size. >> >> The point is for the target picture to still be "understandable" - yet I >> target getting down to 5K. >> >> Are there libraries out there that could help me start ? >> >> Thanks >> >> Philippe >> >> > Python Imaging Library (PIL). > > http://www.pythonware.com/products/pil/ > > -Larry Bates -- http://mail.python.org/mailman/listinfo/python-list
Re: image reduction script
Philippe Martin wrote: > Hi, > > I need to write a script to reduce the resolution/color depth of an image > (ex: .jpg) based on a target size. > > The point is for the target picture to still be "understandable" - yet I > target getting down to 5K. > > Are there libraries out there that could help me start ? > > Thanks > > Philippe > > Python Imaging Library (PIL). http://www.pythonware.com/products/pil/ -Larry Bates -- http://mail.python.org/mailman/listinfo/python-list
image reduction script
Hi, I need to write a script to reduce the resolution/color depth of an image (ex: .jpg) based on a target size. The point is for the target picture to still be "understandable" - yet I target getting down to 5K. Are there libraries out there that could help me start ? Thanks Philippe -- http://mail.python.org/mailman/listinfo/python-list
