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Maniphest T47168

bpy.ops.paint.project_image(image=image_name) degrades high dynamic range to ~8bit
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Description

System Information
Ubuntu 14.04

System: Kernel: 3.19.0-43-generic x86_64 (64 bit, gcc: 4.8.2) Desktop: Gnome Distro: Ubuntu 14.04 trusty
Machine: Mobo: ASUSTeK model: SABERTOOTH X79 version: Rev 1.xx Bios: American Megatrends version: 4502 date: 10/15/2013
CPU: Hexa core Intel Core i7-4930K CPU (-HT-MCP-) cache: 12288 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 49503.9

Clock Speeds: 1: 1316.132 MHz 2: 2101.558 MHz 3: 1300.535 MHz 4: 1294.734 MHz 5: 2049.222 MHz 6: 1799.144 MHz 7: 1805.074 MHz 8: 1717.031 MHz 9: 1672.429 MHz 10: 1703.882 MHz 11: 1668.046 MHz 12: 2000.625 MHz

Graphics: Card-1: NVIDIA GK110B [GeForce GTX 780 Ti] bus-ID: 01:00.0

Card-2: NVIDIA GK110B [GeForce GTX 780 Ti] bus-ID: 02:00.0 
X.Org: 1.17.1 drivers: nvidia,nouveau (unloaded: fbdev,vesa) Resolution: 1920x1200@59.9hz 
GLX Renderer: GeForce GTX 780 Ti/PCIe/SSE2 GLX Version: 4.5.0 NVIDIA 352.63 Direct Rendering: Yes

Blender Version
Broken: 2.76.b f337fea

Short description of error

project_image function degrades high dynamic range to apparently 8bits, even when it saves into 32bit image.

Detailed description and examples are in Blender Exchange Questions --

http://blender.stackexchange.com/questions/44698/how-to-project-an-image-of-high-dynamic-range

http://blender.stackexchange.com/questions/44328/is-it-possible-to-increase-the-dynamic-range-of-external-quick-edit?lq=1

Example file:

https://github.com/dimus/project_image/raw/master/project_image.blend

Example Image

Revisions and Commits

rB Blender
rB5d45c2bf653c Fix T47168: Project image looses float precision

Related Objects

Event Timeline

Dmitry Mozzherin (dimus) created this task.Jan 12 2016, 1:37 PM
Dmitry Mozzherin (dimus) raised the priority of this task from to 90.
Dmitry Mozzherin (dimus) updated the task description. (Show Details)
Dmitry Mozzherin (dimus) added a project: BF Blender.
Dmitry Mozzherin (dimus) edited a custom field.
Dmitry Mozzherin (dimus) added a subscriber: Dmitry Mozzherin (dimus).
Bastien Montagne (mont29) lowered the priority of this task from 90 to 30.Jan 12 2016, 3:40 PM
Bastien Montagne (mont29) added a subscriber: Bastien Montagne (mont29).

This is huge and complex file… Can you please make a simple, small .blend file, with clear steps to reproduce the issue, as requested by the submission template and guidelines? We need simple cases to understand and investigate issues easily.

Have had a quick look at project_paint code, there is a TODO in it related to reprojection, it only uses 8bit data currently. Should not be hard to add float support, but having a simple file making it easy to test would help a lot…

Dmitry Mozzherin (dimus) added a comment.Jan 13 2016, 1:27 AM

I removed images from the blend file (https://github.com/dimus/project_image/raw/master/project_image.blend) and added text with steps to reproduce the problem. Optionally with "git clone https://github.com/dimus/project_image.git" you can get the blend file and an external render.exr file to use for projection.

More detailed steps are given in http://blender.stackexchange.com/a/44705/1311

Campbell Barton (campbellbarton) claimed this task.Jan 14 2016, 8:29 AM
Campbell Barton (campbellbarton) changed the task status from Unknown Status to Resolved by committing rB5d45c2bf653c: Fix T47168: Project image looses float precision.Jan 14 2016, 10:11 PM
Campbell Barton (campbellbarton) added a commit: rB5d45c2bf653c: Fix T47168: Project image looses float precision.