Optimizing Image Cropping and Writing Performance with Ruby Vips #406
Replies: 1 comment 5 replies
-
|
Hi @JohnAnon9771,
img = Vips::Image.new_from_file(image_path)
bbox = img[3].find_trim
img.crop(*bbox).write_to_file("x.png")How large are these files? PNG is a very slow format, so if the images are large, write will take a long time. Are there any other formats you could use? webp or tiff would probably be quicker. |
Beta Was this translation helpful? Give feedback.
-
|
Yes, they are 4200x4800 png images, with an average size of 10mb. Unfortunately, I can only use png, as the image will be sent to a printer that only accepts png. |
Beta Was this translation helpful? Give feedback.
-
|
Ah, shame. Yes, it'll be slow: So 1.75s just for a 4800 x 4200 PNG write on this Ubuntu 24.04 PC. PNG write is single-threaded, sadly. Most PNG write time is spent in libz, so it might be worth experimenting with other versions. It's such a critical library that many people have attempted faster implementations, for example libz-ng: https://github.com/zlib-ng/zlib-ng You can also disable PNG zip compression. This makes it a lot quicker, though files will be larger: 600k vs. 470k. |
Beta Was this translation helpful? Give feedback.
-
|
Or tiff with zlib compression: Almost twice as fast as PNG, with much better compression. PNG really is a poorly designed format. |
Beta Was this translation helpful? Give feedback.
-
|
Thank you very much for the super detailed answer! I'll try to do it without compression, it really did increase the speed a lot. One question: does zlib-ng work automatically with libvips? How can I use it? |
Beta Was this translation helpful? Give feedback.
-
|
You might need to rebuild libpng, or libspng. You'd have to experiment. |
Beta Was this translation helpful? Give feedback.
Uh oh!
There was an error while loading. Please reload this page.
Uh oh!
There was an error while loading. Please reload this page.
-
Hi,
I’m working on a project that uses Ruby Vips to crop and adjust images for printing. However, I’ve encountered performance issues, specifically with the speed of writing the cropped image to a file. The writing process is quite slow, and I’d like to know how I can optimize this further to speed up the entire operation, as I need to transmit the processed image as quickly as possible.
Here’s the relevant code I’m using for cropping the image:
The trimming works fine, but the file writing step (
write_to_file) takes a significant amount of time. Do you have any suggestions for speeding up the writing process or improving overall performance? Any insights would be greatly appreciated!Thank you!
Beta Was this translation helpful? Give feedback.
All reactions