Field compute= and make thumbnail

[Pepe Araya]

Hello,

I have a table where only store images related to x Article. 

db_define_table('images',

      Field('original_image', 'upload'),

      Field('thumb_image', 'upload')

Is efficient even, possible to make  'thumb_image' Field a computed Field?

Something like:

      Field('thumb_image', 'upload', compute= lambda r:make_thumb(r, 85))

def make_thumb(r, thumb_size):

    try:

        from PIL import Image

    except:

        raise ImportError, "Requires PIL installed in your system."

    size = (thumb_size, thumb_size)

    ....

Any help is welcome!

thanks!

[Anthony]

See http://www.web2pyslices.com/main/slices/take_slice/62 (also, look at the comments on that post for additional options).

 

Anthony

[pbreit]

Here's what I do. Seems to work.

    Field('image', 'upload', uploadfolder=request.folder+'static/uploads',

            requires=IS_EMPTY_OR(IS_IMAGE())),

    Field('image_display', 'upload', uploadfolder=request.folder+'static/uploads',

            compute=lambda r: resize_image(r['image'], (320,320), 'display'),

            readable=False, writable=False),

    Field('image_thumb', 'upload', uploadfolder=request.folder+'static/uploads',

            compute=lambda r: resize_image(r['image'], (150,130), 'thumb'),

            readable=False, writable=False),

def resize_image(image, size, path, rotate=0):

    import os.path

    from PIL import Image'

    if image:

        try:

            img = Image.open('%sstatic/uploads/%s' % (request.folder, image))

            img = img.convert("RGB")

            img.thumbnail(size, Image.ANTIALIAS)

            img = img.rotate(rotate)

            root, ext = os.path.splitext(image)

            filename = '%s_%s%s' %(root, path, ext)

            img.save('%sstatic/uploads/%s' % (request.folder, filename))

            return filename

        except Exception, e:

            return e

    else:

        return None

[Pepe Araya]

oh! thanks very much!

I'll try

pepe