Optimage - Advanced image optimization tool

@matias_vad As far as I can tell just more buzz words? "Advanced metrics", "visually perceived", etc. I’ll stick with ImageOptim for now.

@matias_vad Hey Matias, I get this question a lot. Without a doubt, ImageOptim is great, huge thanks to Kornel Lesiński for making it. Optimage can do automatic lossy (visually lossless) optimizations on JPEGs and PNGs. It means you don't have to manually tune JPEG quality for each image and can get some PNGs quantized to 256 colors if visual differences are negligible. Optimage has a lot of tweaks to compression algorithms to squeeze some more bytes (Pareto principle here). But much more bytes are saved by exhaustively trying all possible image data representations, e.g. fast brute forcing of PNG delta filters, dirty alpha, palette sorting. Optimage is careful to things like color profiles, has a Convert to sRGB option, uses a tiny sRGB ICC profile for JPEGs. I have plans to add support for container formats like ICO and ICNS, lossless rotation of JPEGs according to Orientation meta in Exif, aPNG optimization, etc. There's a good PNG test corpus at http://css-ig.net/images/png-tes.... Optimage – 276 058 bytes, ImageOptim – 297 561 bytes. But this is just a lossless test.

@cenk Hah, that's alright, I'll try to explain what I mean by that. Copywriting is not my cup of coffee yet (any help is welcome!). Optimage uses a modified quality metric based on Contrast Sensitivity Function (CSF) and contrast masking of DCT coefficients for JPEGs, and a custom one for color-quantized PNGs (major difference is sensitivity to noticeable gradients). There are so many challenges in visually lossless compression. How to estimate current image quality without any references, calculate allowed compression error, and avoid double compression. This is what I've been working for a long time now.

@rrrraulsc WHY?!?

@rrrraulsc Well, if you've really abused the budget for tools, contact me, I'll arrange something :)

@vmdanilov as a web designer I'm always looking for good tools. After trying Squash I am still using powerful compresor Image Alpha https://pngmini.com/ — can we arrange something? :)

@rrrraulsc Optimage does color quantization same as ImageAlpha when it does not hurt visual quality. Sure, send me email (on the website) or PM on Twitter.

@amits510 Not yet, sorry. The CLI client is cross platform but GUI needs work.

@vmdanilov Great app 🙌 Is there any documentation on how to use the CLI?

@zedpelin Thanks! Just run /Applications/Optimage.app/Contents/MacOS/cli/optimage. Will add a proper section to Help.

@lesmond If anyone is up for this, I'll do what I can to help.

@_pascalandy Strange. Can you record a screencast? I have an update coming up, there's a tiny change that may help. But this is the first time I hear about it.

@vmdanilov Sure http://jmp.sh/A4XsLB0. Let's continue the conversation on Twitter :) twitter.com/_pascalandy

@_pascalandy Thanks a lot. Fixed. Expect an update tomorrow.

@shortformernie I'll check that tool, thanks. But I'm already seeing compression levels there. GIFs are on the roadmap. I can't say when though.

@vegardwikeby Agree, expect it in the next update. UI will be improved greatly in the coming months.

@matemedia Can you elaborate please?

@matemedia How long have you been waiting? It does take time. Might be over a minute on large PNGs. I'm working on improving the UI side of this.

@shellehs Optimage does not scale images, but you can use it afterwards to reduce file size of your images.