cbloom rants

I've been thinking about how to do a simple measure of "detail" in images that could be used as a metric for lossy compressors...

I'm testing JPEG-XR (aka HD Photo, aka PTC, aka WPF or WIC codec) using the maximum-size chunk width option and with the optional arithm...

If you actually want to make a fair test vs. JPEG : 1. Don't test JPEG at quality levels below 40, it doesn't work. 2. Don...

First some motivation before we dig into this : Take bmp, downsample convert to YUV 420 (specifically YCbCr 601), upsample and convert ba...

We are constantly faced with these horrible discrete optimization problems. The specific example I've been working on today is YCbCr/...

Ryg has a note on Zeux' Frustum culling series , both are good reads. The thing that struck me when reading it is that you can g...

Well, I'm vaguely considering making my own perceptual test database since you know it's been like 20 years since it was obvious we ...

Let's stop for a second and talk about the tests we've been running. First of all, as noted in a comment, these are not the final t...

Kakadu JPEG2000 (v6.4) can be tuned for visual quality or for MSE (-no_weights) , so we run both : my_soup : Performance in ge...

Well I've had a little bit more success. I still can't get x264 to do full range successfully; or maybe I did, but then I can...