Image upload error when using smarthumb

[Maurice Waka]

I followed this example with this code

db.define_table('article',
                Field("title"),
                Field("article_text", "text"),
                Field("picture", "upload"),
                Field("thumbnail", "upload")
                )
from images import THUMB
from smarthumb import SMARTHUMB
box = (200, 200),
db.article.thumbnail.compute = lambda row: SMARTHUMB(row.picture, box)


db.define_table('uploads',
    Field('name','string'),
    Field('mainfile','upload'),
    Field('thumb','upload',writable=False,readable=False),
    )

I get this error:

File "/home/mauricewaka/web2py/applications/bot/modules/smarthumb.py", line 21, in SMARTHUMB
 while img.size[0] / factor > 2 * box[0] and img.size[1] * 2 / factor > 2 * box[1]:
TypeError: '>' not supported between instances of 'float' and 'tuple'

My path is:

img = Image.open(request.folder + '/uploads/' + image)

[Massimo Di Pierro]

box = (200, 200),


should




box = (200, 200)


(remove the extra comma :-))

[Andrew Rogers]

I had trouble with the above code. Perhaps it was because i am using the uploadseparate =true parameter which means images get dropped into different folders. Or perhaps because i don't know what  i am doing.

Anyhow, the code below works for me. I had to manipulate the thumbnail filename a lot to get it to work. There must be a better way than this though...

# -*- coding: utf-8 -*-

import os

from random import seed

from random import random

try:

    from PIL import Image

except:

    import Image

db.define_table(

    'Media',

    Field('Description'),

    Field('FileReference', 'upload', uploadseparate=True, requires=IS_NOT_EMPTY() and IS_IMAGE(extensions=('jpeg', 'png','jpg','tif'))),

    Field('ThumbnailLocation', type='upload', compute=lambda row: SMARTHUMB(row.FileReference, (100,100))),

    format = '%(Description)s')

def SMARTHUMB(FileReference, box, fit=True, name="thumb"):

    '''Downsample the image.

     @param img: Image -  an Image-object

     @param box: tuple(x, y) - the bounding box of the result image

     @param fit: boolean - crop the image to fill the box

    '''

    

    img_location = GetFullFilename('', FileReference)

    img = Image.open(img_location)

    

    #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 = int(y2 / 2 - box[1] * wRatio / 2)

            y2 = int(y2 / 2 + box[1] * wRatio / 2)

        else:

            x1 = int(x2 / 2 - box[0] * hRatio / 2)

            x2 = int(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)

    #Assume five parts to the filename split on "." eg Media.FileReference.a677042dfcd329d8.6361742e6a7067.jpg

    #The 4th part seems to effect the filename and extension

    fn_parts = FileReference.split(".")

    seed(1)

    thumb_filename = fn_parts[0] + '.' + fn_parts[1] + '.' + fn_parts[2][0:2] + str(random())[2:16]  + '.' + fn_parts[3] + '.' + fn_parts[4]

    img_location = GetFullFilename('', thumb_filename)

    img.save(img_location)

    

    return thumb_filename

def GetFullFilename(NamePrefix, FileReference):

    folder = FileReference[20:22] # The first two characters of the 3rd part of the name

    FileLocation = request.folder + '\\uploads\\Media.FileReference\\' + folder + '\\' + NamePrefix + FileReference

    return FileLocation