More Emphasis and Benchmarks for Image Size

[RehanSaeed]

ImageSharp looks great and has an emphasis on performance. What I can't find is any mention of image size. For static images, I'd run a tool like imagemin to get the size down but in a dynamic scenario, you'd want ImageSharp to generate an image as small as possible in the first place.

There are benchmarks for performance. Can a similar benchmark for image size be created to show image size as compared to System.Drawing and also after using a tool like imagemin?

[JimBobSquarePants]

@RehanSaeed This more a question for our gitter channel but I'll attempt to answer.

Output size is something we care deeply about and has been a major focus alongside performance. It's not something I would like to spend a great deal of time benchmarking or reporting on though as there's no easy way to report the data.

I'll summarize what we do know now though.

• Bitmap - There will be no difference since it's an uncompressed format.
• Jpeg - There's simply too many variables. resampling algorithms, color accuracy. They all contribute to the image size so sometimes we win, sometimes System.Drawing wins.
• Gif - System.Drawing produces such poor output that such a comparison is meaningless. We however can produce incredibly detailed 256 color output (see the Calliphora fly below) and support animated gifs
• Png - We use a smarter heuristic algorithm than System.Drawing and will always produce smaller output (~10-15%). We also support smaller indexed pngs and are able to produce images that match the quality, yet beat the size of PngQuant

All in all I believe we do much better than System.Drawing in both quality and size of our image output.

We cannot, however, compete with a dedicated set of tools like ImageMin. ImageMin uses a multitude of different tools that use various techniques (some brute force) to optimize images, none of which can be ran in a particularly performant manner.

Hope that helps

James

Our gif output

[RehanSaeed]

Thanks!

Some idea of where ImageSharp stands in the field in relation to other frameworks is all I wanted. I think a comparison to something like imagemin while I grant you is totally unfair, I still think it acts as a kind of control i.e. this is as small as the image is ever going to get if you threw CPU's at it.

[JimBobSquarePants]

@RehanSaeed Happy to help! 😄

Yeah, the ImageMin toolset is a great target to aim for. It'll be interesting to see what we can achieve in the future.