| Now that ImageMagick version 7 is released, we continue to maintain the legacy |
| release of ImageMagick, version 6, at https://legacy.imagemagick.org. Learn how |
| ImageMagick version 7 differs from previous versions with our porting guide. |
| |
| We discovered a bug in the pseudo-random generator prior to ImageMagick |
| 7.0.9-11, the first 3 values repeated because the random state was not |
| initialized properly. As a consequence of the fix, expect a different |
| numerical sequence when seeding (-seed). |
| |
| ImageMagick best practices strongly encourages you to configure a security |
| policy that suits your local environment. |
| |
| The ImageMagick development process ensures a stable API and ABI. Before each |
| ImageMagick release, we perform a comprehensive security assessment that |
| includes memory error, thread data race detection, and continuous fuzzing |
| to detect and prevent security vulnerabilities. |
| |
| As an analog to linear (RGB) and non-linear (sRGB) color colorspaces, as |
| of ImageMagick 7.0.7-17, we introduce the LinearGray colorspace. Gray is |
| non-linear grayscale and LinearGray is linear (e.g. -colorspace linear-gray). |
| |
| Want more performance from ImageMagick? Try these options: |
| |
| add more memory to your system; |
| add more cores to your system; |
| reduce lock contention with the tcmalloc memory allocation library; |
| push large images to a solid-state drive, see large image support. |
| |
| If these options are prohibitive, you can reduce the quality of the image |
| results. The default build is Q16 HDRI. If you disable HDRI, you use half |
| the memory and instead of predominately floating point operations, you use |
| the typically more efficient integer operations. The tradeoff is reduced |
| precision and you cannot process out of range pixel values (e.g. negative). If |
| you build the Q8 non-HDRI version of ImageMagick, you again reduce the memory |
| requirements in half-- and once again there is a tradeoff, even less precision |
| and no out of range pixel values. For a Q8 non-HDRI build of ImageMagick, |
| use these configure script options: --with-quantum-depth=8 --disable-hdri. |
