Comments (2)
It’s really just that. E. g. for maximal PNG compression I call ect_x64 -30060 --allfilters-b --pal_sort=120 --strip foo.png
, where 30060
means “three blocksplitting passes with 60 iterations”.
I had a few benchmarks regarding block splitting passes and iterations here, but modern browsers most likely won’t display the graphics because my site is not HTTPS-encrypted. You’ll have to use “view source” if you’re interested.
Note that I don’t use more than 60 iterations because that would trigger the extremely slow Ultra2 mode.
from efficient-compression-tool.
ECT has little documentation on higher compression levels. This is in part intentional as for most use cases level 7 is more than sufficient and using more advanced settings results in wasting CPU time for minuscule compression gains.
If you do want to use higher levels krishty's answer explains the behavior quite well. ultra2 is still very slow and not recommended most of the time, but is several times faster for most cases based on some recent changes.
from efficient-compression-tool.
Related Issues (20)
- Could NOT find Threads (missing: Threads_FOUND) HOT 1
- Use CI to build release binaries
- How to only strip the metadata from PNG files? HOT 1
- ECT built from source for Apple Silicon is slower than release x86/64 build HOT 6
- `-strip` with gzip does not drop original name in metadata HOT 2
- Suggestion for lossless confirmation HOT 1
- Infinite loop via FileOptimizer since 0.9.2 HOT 44
- Using '-zip' option leaves temporary '..zip' file when used on folder HOT 2
- Request: Document what the `--strict` option does HOT 1
- Is building on arm64 / aarch64 supported? HOT 2
- Access violation in merge.h in windows release build only HOT 1
- [Enhancement] Animated PNG (APNG) support HOT 4
- --disable-png and --disable-jpg are ignored when -gzip is given. HOT 2
- Per file and per block multithreading don't work correctly HOT 3
- replace functions with Array
- "bad png file" if Japanese character is in path HOT 1
- Possible equivalent of `--mt-file` when recompressing files contained zip and gzip archives HOT 1
- Please add unicode support HOT 3
- Request: Distribute via homebrew HOT 1
- Prebuilt binary with PGO here HOT 8
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