Legacy ImageMagick Discussions Archive

I have an image https://dl.dropbox.com/u/79309031/image.jpg
The size of file is 1650 bytes.
My code:

Image newimage( "image.jpg" );
cout << newimage.fileSize() << endl; // point1
Blob blob1;
newimage.write(&blob1);
cout << newimage.fileSize() << endl; // the same call as in point1!

And the output is:
1650
1653
What happened?
Why filesize has changed after writing to blob?
IM 6.7.6.9
Ubuntu 11.04

Not a bug, JPEG is lossy and its not unusual for the file size to change when its recompressed. You can adjust the compression quality to reduce the output image size.

Yes, but where is recompression in my code?
I was sure, that Image::write function doesn't change the object, it just writes data somewhere with optional parameters.
Could you please clarify?

Compression/Decompression is automatic with JPG format data and causes differences between input and output

Legacy ImageMagick Discussions Archive

Image filesize changes after writing to Blob. Bug?

Image filesize changes after writing to Blob. Bug?

Re: Image filesize changes after writing to Blob. Bug?

Re: Image filesize changes after writing to Blob. Bug?

Re: Image filesize changes after writing to Blob. Bug?