[Info-vax] simple image processing

[Rich Jordan]

On Aug 18, 7:20 am, Jan-Erik Soderholm <jan-erik.soderh... at telia.com>
wrote:
> Phillip Helbig---undress to reply wrote 2011-08-13 11:20:
>
> > Thus, I'm looking for a quick and easy method to generate
> > thumbnails.
>
> OK, here is one working example. Takes 14 sec to convert 124 files
> on my 466 Mhz XP900. Two logical names points to the source
> and target directories. The logicals are read by Python and the
> source dir is scanned. Each file is copied as a thumbnail with
> an *_tn.jpg filename to the target dir.
>
> Since Python is a full programming language/environment you can
> add any other processing you need.
>
> Notes.
> The "for" is a simple way to "walk a directory".
> The "splitext" is like f$parse.
> All image processing is done by the three im... lines.
>
> Enjoy !
>
> Jan-Erik.
>
> -------------------------------------------------------
> $ def source_dir user:[janne.tn_test.source]
> $ def target_dir user:[janne.tn_test.target]
> $!
> $ python
>
> import os, sys
> from PIL import Image
> from vms.rtl.lib import get_logical
>
> s, src_dir, m_index = get_logical('SOURCE_DIR', 'LNM$FILE_DEV')
> s, trg_dir, m_index = get_logical('TARGET_DIR', 'LNM$FILE_DEV')
>
> size = 64, 64
>
> for infile in os.listdir(src_dir):
>
>    outfile = trg_dir + os.path.splitext(infile)[0] + \
>              "_tn" + os.path.splitext(infile)[1]
>
>    infile = src_dir + infile
>
>    try:
>      im = Image.open(infile)
>      im.thumbnail(size)
>      im.save(outfile, "JPEG")
>    except IOError:
>      print "cannot create thumbnail for", infile
> -------------------------------------------------------
>
> $ dir <...>4x4*
>
> Directory USER:<JANNE.TN_TEST.SOURCE>
>
> 4X4KEYBRD_1.JPG;1          129  29-JUL-2011 16:22:23.59
> 4X4KEYBRD_2.JPG;1          129  29-JUL-2011 16:22:23.75
> 4X4KEYBRD_3.JPG;1          323  29-JUL-2011 16:22:23.22
>
> Total of 3 files, 581 blocks.
>
> Directory USER:<JANNE.TN_TEST.TARGET>
>
> 4X4KEYBRD_1_TN.JPG;1         3  18-AUG-2011 14:10:28.43
> 4X4KEYBRD_2_TN.JPG;1         3  18-AUG-2011 14:10:28.54
> 4X4KEYBRD_3_TN.JPG;1         3  18-AUG-2011 14:10:28.65
>
> Total of 3 files, 9 blocks.
>
> Grand total of 2 directories, 6 files, 590 blocks.
> $

Neat!  Thanks for posting that.