[PD] Make a grid for choosing videos. How

[august]

> > ImageMagick provides 'convert':
> > 
> > convert -resize 160x120 image.jpg image-thumb.png
> > 
> > Note that this preserves aspect ratio, which may or may not be what you 
> > want (I haven't worked out how to stretch an image to a precise size 
> > with convert yet, if someone knows then please tell me!).
> 
> You could also use Python's Image module (PIL) to do thumbnails from
> within Pd, however thumbnails from videos are a different issue, I
> guess. 


for video, you could probably use pymedia to produce thumbnails.

	http://pymedia.org/

or just use mplayer to render out a frame.

but, just fyi, you will probably want to use imagemagick's convert for
resizing images for thumbnails.  It has a few options for it's
resampling algo, but I find the default one to be better than GD's or PIL.
It's also much slower.

below is a python script for converting images.  could be easily
modified to use mplayer to render out a frame and resize it using
convert.

-august.



----------------------------------------------------------------


from glob import glob
import os
import Image  #PIL


def doConvert(w,h, item, folder, force = False ):
        path = folder + "/" + item
	# make a folder to hold all the thumbnails
        if ( os.path.exists(path) ):
                print item + " exists in folder: " + folder
                if (force):
                        print "forcing convert for " + folder + "/" + item
                        command = "convert " + item + "  -resize " + str(w) + 'x' + str(h) + " " + folder + "/" + item
                        print command
                        os.system( command )
        else:
                command = "convert " + item + "  -resize " + str(w) + 'x' + str(h) + " " + folder + "/" + item
                print command
                os.system( command )

def doImage(item, force = False):
        image = Image.open(item)
        x,y = image.size
        msize =648.0  #864
        ssize =162.0  #216

        mw,mh=10,10
        sw,sh=10,10

        if (x > y):
           sratio = x/ssize
        else :
           sratio = y/ssize
        sw = int( x/sratio )
        sh = int( y/sratio )
        doConvert(sw,sh,item, "thumbnails", force)


def getList():
        return glob("*.jpg") + glob("*.JPG")

# go throught the current directory looking for jpegs and make thumnails
for item in jpglist:
	doImage(item, force)