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JamieMason / ImageOptim-CLI

Make optimisation of images part of your automated build process
https://foldleft.io/image-tools
MIT License
3.45k stars 126 forks source link

preferProgressive: true #28

Closed JamieMason closed 11 years ago

JamieMason commented 11 years ago

Run some tests to see whether existing tools convert images to progressive or not, and whether this can be controlled.

Progressive images are likely to be slower/larger in actual terms but perceptually faster/smaller.

JamieMason commented 11 years ago

Or not, better news...

it looks like progressive JPEGs are smaller on average. But that’s only the average, it’s not a hard rule. In fact in more than 15% of the cases (1611 out of the 10360 images) the progressive JPEG versions were bigger.

- http://www.yuiblog.com/blog/2008/12/05/imageopt-4/