Legacy ImageMagick Discussions Archive

Another example of how it should work. Taking the most recent photo (missile above a plane), resizing it to x500 using '-resize x500' and adding alpha with '-resize x500 -alpha opaque', and uploading the two resulting images to BPG Web Encoder : output-x500.png 569.73 KB BPG size : 17.65 KB output ...

You may be interested in time and space trials I've done for PNG and some other formats: http://im.snibgo.com/spdsiz.htm The PNG chart definitely looks useful for someone who frequently saves PNG images. As a sort of contrast though, this is for IM; I also sometimes use GIMP, which has a ...

If it's possible for PNG to encode alpha as a separate plane, then a simple test could determine whether this should be done. One issue is that while you might have an image where alpha changes with anti-aliasing at the border of a figure, and the image also changes at that point and has a ...

I know a bit, but basically if people confirm that the problem exists, someone would still need to have the motivation to fix it. This problem does not affect most people. If a large PNG file has an unnecessary alpha channel, converting to JPG will automatically remove it. If converting to JP2, it's ...

Doesn't IM always store pixels at a value specific to the build? For Q16, 16 bits per channel per pixel, regardless of whether the source image was an 8-bit palette or a 1-bit bilevel PNG. It may be that Imagemagick is reading a PNG that has 256 or fewer colors, converting it to palette ...

This might be a bug in libraries that are managed by other people. Even if a PNG or JPEG-2000 image has an alpha channel that is fully on, it can greatly increase an image's size. My imagemagick is 6.7.7-10 2014-08-21 Q16, the default installation from Ubuntu 14.10. (I know it's not the latest ...