This morning's row. 3.7km lake loop. On EXR/concept2

Sprints 100m and 750m
Still rowing well within myself, coming back from a health setback. But pleased with my progress.
#EXR #rowing

I updated #exrtact with a new tool exrmean to find the #mean of a sequence of #EXR image files. Only works with float16 (half precision) R G B data, other channels are ignored. All images must have the same dimensions. Accumulation is done in float32 (single precision), output is float16 again.

I updated my #exrtact project (miscellaneous tools for #EXR image files) with a new program exrquantile that outputs data similar in purpose to a #histogram (it sorts the data from a given channel and outputs the values at regularly spaced counts, so you can easily read off the minimum, maximum, median, and other #quantile).

https://mathr.co.uk/exrtact

https://archive.org/download/zoom-interpolator-tests/mathr-exr-zoom-interpolator-gl4-test-3.mp4 950MB 1920x1080p60 3m35s

#MandelbrotSet #fractal #zoom #video #ColourCycling #Dynamo

raw iteration data keyframes from #KF in #EXR container colourized using #OpenGL 4 with per-output-frame processing. 32 samples per pixel from 4x4 sized keyframes for #AntiAliasing

昨日の #DHW での #EXR さんによる非常にまじめな製造業に向けた #VRM 案件（発表者はVTuberP）
https://t.co/lzVnSQzGdN https://t.co/bm9d1IYfHi

#DHW #EXR https://t.co/xFjUSSwwga

7,000km以上離れた日豪同時リハーサルを無事終え20日に
#SIGGRAPHAsia2019
#RealTimeLive で発表します!

Special Thanks @mikeseymour
#EXR @virtual_ayumu @kanipon
#Hapbeat
@hapbeat__ @yus988
#VirtualCast @virtual_cast @MobileHackerz
#WFLE @eijiaraki
@milkyqueen_idol @algorithm_jc https://t.co/VmZSAU98Pd

RT @VRonjp: 【超気になる！】
あの感動が再び！
豪州で開催されます「SIGGRAPH ASIA 2019」で #GREEVRStudioLab 、
#直感アルゴリズム 、#ミルキークイーン さんらがREAL TIME LIVE! に日本勢として登場します。20日です！
#NTTドコモ #5G
#バーチャルキャスト
#ジャストプロ
#EXR
#Hapbeat
#SA19RTL https://t.co/GFlKKvd4LT

https://mathr.co.uk/exrtact

new feature: channel filtering in tiled assembly, example usage:

```
./exrtactile input 10 0 output.exr R G B
```

#EXR

Hacking on #fragmentarium #fragm fork to make it possible to load arbitrary channels from #EXR image files (for example, raw fractal iteration data saved from #KF).

It mostly works, except when enabling time-based animation (seems channels reset to RGBA? investigating...). The attached GIF was done with manual stop motion instead of the animation render functionality.

made a little tool to extract channels and preview images from #EXR files
https://mathr.co.uk/exrtact
very basic but useful for #debug (I used it to be able to view kf's `NF` channel in exrdisplay which led me to notice and fix vertical flipping)

Productive evening working on #kf. New stuff:

- Save/Ctrl-S has an option to add timestamps to the filename instead of overwriting
- LogLog and ATan iteration count transfer functions
- status bar now uses more of the window width dynamically, which should improve accessibility if the system font size is increased (information less likely to be truncated)
- pruned some dead code
- added a quick start guide to the documentation
- made Octave/Matlab utility scripts into function files to be more compatible

and I finished the main new feature of the next release:

- #EXR file input and output including 16bit linear half-float RGB (output only, full accuracy, suitable for post-processing in #darktable(*) or other #HDR software), raw iteration data, and full metadata.

Hopefully this means I can deprecate the custom KFB file format, and even more hopefully other #escape #time #fractal #software will adopt the EXR conventions of KF, which are documented here:
https://fractalforums.org/programming/11/towards-a-common-file-format-for-2d-escape-time-iteration-data/3017/msg16250#msg16250

(*) needs darktable from git, or 2.8 when it is released, otherwise you can `convert kf-output.exr dt-input.exr` to remove the extra channels that confuse earlier darktable versions

#autostereogram for #crosseyed viewing

#depth map exported to #exr from my "raymond" #raytracing thingy implemented in #glsl inside #fragmentarium , converted to #pfm using #gimp . EXR data must be in [0..1] for GIMP to understand it (otherwise it clips, not sure if it's clipped by FragM or GIMP). Not sure if sRGB non-linear response curve is mangling my data.

#fabric texture from a photo I took, cropped into a narrow vertical strip and made #seamless in #gimp

depth and texture combined with #homemade #software . took many iterations to get something that didn't make my eyes hurt too much. depth #discontinuity is jarring, too-small texture detail is distracting.

Refs:
- http://paulbourke.net/dataformats/pbmhdr/ for PFM file format (like PGM/PPM but float32 data)