thumbs

gistfile1.py

#!/usr/bin/env python
# coding: utf-8

from PIL import Image
import sys, os

#@app.route("/thumbs")
def thumbs():

     # not good (type of values) but something like this
     file = request.args.get('file', None)
     width = request.args.get('width', 120)
     height = request.args.get('height', 90)
     quality = request.args.get('height', 70)
     crop = request.args.get('crop', False)

     # image
     img = Image.open(file)
     newpath = ""
     out = file(newpath, "w")
     resize(img, (width, height), crop, out, quality)

     return send_file(out)

def resize(img, box, fit, out, quality=75):
    '''Downsample the image.

    script example :
 >>> import Image, os, sys
 >>> for filename in sys.argv[1:]:
 >>>     img = Image.open(filename).resize( (200,200) )
 >>>     out = file(os.path.splitext(filename)[0]+"_thumb.jpg", "w")
 >>>     try:
 >>>         img.save(out, "JPEG")
 >>>     finally:
 >>>         out.close()

     @param img: Image -  an Image-object
     @param box: tuple(x, y) - the bounding box of the result image
     @param fix: boolean - crop the image to fill the box
     @param out: file-like-object - save the image into the output stream
    '''
    #preresize image with factor 2, 4, 8 and fast algorithm
    factor = 1
    while img.size[0] / factor > 2 * box[0] and img.size[1] * 2 / factor > 2 * box[1]:
        factor *= 2
    if factor > 1:
        img.thumbnail((img.size[0] / factor, img.size[1] / factor), Image.NEAREST)

     #calculate the cropping box and get the cropped part
    if fit:
        x1 = y1 = 0
        x2, y2 = img.size
        wRatio = 1.0 * x2 / box[0]
        hRatio = 1.0 * y2 / box[1]
        if hRatio > wRatio:
            y1 = y2 / 2-box[1] * wRatio / 2
            y2 = y2 / 2 + box[1] * wRatio / 2
        else:
            x1 = x2 / 2-box[0] * hRatio / 2
            x2 = x2 / 2 + box[0] * hRatio / 2
        img = img.crop((x1, y1, x2, y2))

    #Resize the image with best quality algorithm ANTI-ALIAS
    img.thumbnail(box, Image.ANTIALIAS)

    #save it into a file-like object
    img.save(out, "JPEG", quality = quality)
    #resize
"""
<a href="{{ imagepath }}">
<img src="{{ url_for('thumbs', file=imagepath, width=120, height=90) }}" 
alt="" />
</a>
"""
if __name__ == '__main__':
    if len(sys.argv) > 1:
        for filename in sys.argv[1:]:
            img = Image.open(filename)
            out = file(os.path.splitext(filename)[0] + '_thumb_%dx%d.jpg' % (120, 90), 'w')
            resize(img, (120,90), False, out, 90)
    else:
        print "For make thumbs, please exec %s [filenames]" % __file__