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Image Save Fallback To make_blob Is Very Slow #143

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mdallen22 opened this Issue Aug 26, 2013 · 3 comments

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@mdallen22
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mdallen22 commented Aug 26, 2013

When saving an image with the file parameter, if the file is not an instance of file_types, image.make_blob is written to the file stream instead of calling MagickWriteImageFile. This is very heavy for large images. A work around may be to create a temporary file, call MagickWriteImageFile on the temporary file, and then move the contents of the temporary file to the permanent file. I am willing to implement this and test out the performance increases when I have free time.

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dahlia commented Aug 27, 2013

I could’t any better way to write it to file-like objects that don’t have fd (via .fileno() method) e.g. io.BytesIO, StringIO.StringIO etc. Any ideas?

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mdallen22 commented Aug 27, 2013

After some more time with this, the problem does not appear to be with make_blob but with a bug when saving animated gifs to a file object. If you save an animated gif using the file parameter only the last frame of the image is saved. The speed increase I was seeing when using a temporary file to bypass make_blob was not because make_blob was slow, but because MagickWriteImageFile was only saving one frame of the animation.

I fixed this bug here #144. This branch was off of 0.3-maintenance. If you would like me to branch off of master instead, let me know.

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dahlia commented Aug 28, 2013

See also #145.

@dahlia dahlia closed this in 93341d1 Sep 9, 2013

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