Hi,
I don`t know if it's a bug with ImageMagick but here is our problem:
We are using ImageMagick in our photo Webservice (several thousand photos a day) and I would say that more than 99% of the time the pictures are resized correctly. The remaining 1% is composed of partial grey images (I guess corrupted image). We are using ImageMagick with ‘exec convert’ in a php script. We are able to get the error by redirecting the ‘stderr’ to ‘stdout’.
So basically it’s the resize function that seems to be the problem. If a specific image is corrupted, we are able to regenerate it using the same script with the same arguments so the problem is not the original photo.
My question is: is it possible that ImageMagick fail in the process of transforming an image, didn’t return any errors but returned an incomplete (partial) image?
Here are the versions of the software we use:
Php 5.0
ImageMagick 6.2.4 (We will update to the latest version as soon as possible)
Linux Ubuntu 6.06.1 LTS
Any hint will be appreciated,
Thanks a lot!
Corrupted images (partial grey jpeg)
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mpalmerlee
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Re: Corrupted images (partial grey jpeg)
I had this same problem and it turned out to be an error when I would process the images:
Corrupt JPEG data: premature end of data segment
But this error may have been caused by problems in the downloading of my images to process them (like it only had a partial image to download). Basically I was able to detect this condition in the code that calls imagemagick by listening to the sdterr and then retry the process on failure.
-Matt
Corrupt JPEG data: premature end of data segment
But this error may have been caused by problems in the downloading of my images to process them (like it only had a partial image to download). Basically I was able to detect this condition in the code that calls imagemagick by listening to the sdterr and then retry the process on failure.
-Matt
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fmw42
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- Location: Sunnyvale, California, USA
Re: Corrupted images (partial grey jpeg)
What error message did you get? Is the input image gray to start?
IM 6.2.4 is really very ancient (over 600 versions old). It is not surprising that there may be bugs that have been subsequently fixed. However, to be sure, it would be best if you could provide a link to an example image that fails and verify that a simple resize fails.
So something like
convert image.jpg -resize .... failedimage.jpg
It could also be an issue with the libjpeg.
Is the jpg image that fails in CMYK colorspace? IM generally works best in RGB colorspace. Perhaps you just need to convert to sRGB (with profiles or -colorspace sRGB) before the resize.
IM 6.2.4 is really very ancient (over 600 versions old). It is not surprising that there may be bugs that have been subsequently fixed. However, to be sure, it would be best if you could provide a link to an example image that fails and verify that a simple resize fails.
So something like
convert image.jpg -resize .... failedimage.jpg
It could also be an issue with the libjpeg.
Is the jpg image that fails in CMYK colorspace? IM generally works best in RGB colorspace. Perhaps you just need to convert to sRGB (with profiles or -colorspace sRGB) before the resize.