16bit Tiff save broken in Blender 2.60 #29076

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Morten Mikkelsen · 2011-10-28T19:47:05+02:00

Morten Mikkelsen commented

2011-10-28 19:47:05 +02:00

%%%In 2.60 Tiff 16 bit save is broken.

I'll be attaching a scene which was made by opening the default scene with std. downloaded Blender 2.60.
First I checked 16 bit under tiff in the output section of the render panel
and then I choose "save image as" and pick tiff rgb. The result becomes an 8 bit tiff.
I've been able to save 16 bit tiffs in Blender 2.59 so the support has clearly been broken since then.

I'd also like to report a second issue. If I "load image" a 16 bit tiff then the only way to get it back out without loosing precision in 2.60
is to save it as .exr before saving the .blend. I'd also like to point out if I do the same thing with 16 bit png they'll load into Blender
but unlike 16 bit tiff they are immediately squashed to 8 bits upon load whether I save out as exr or not before saving blend.

I'll attach a separate blend for that which was made by me loading a png and then saving out as exr just before saving blend.
%%%

%%%In 2.60 Tiff 16 bit save is broken. I'll be attaching a scene which was made by opening the default scene with std. downloaded Blender 2.60. First I checked 16 bit under tiff in the output section of the render panel and then I choose "save image as" and pick tiff rgb. The result becomes an 8 bit tiff. I've been able to save 16 bit tiffs in Blender 2.59 so the support has clearly been broken since then. I'd also like to report a second issue. If I "load image" a 16 bit tiff then the only way to get it back out without loosing precision in 2.60 is to save it as .exr before saving the .blend. I'd also like to point out if I do the same thing with 16 bit png they'll load into Blender but unlike 16 bit tiff they are immediately squashed to 8 bits upon load whether I save out as exr or not before saving blend. I'll attach a separate blend for that which was made by me loading a png and then saving out as exr just before saving blend. %%%

Morten Mikkelsen commented

2011-10-28 19:47:05 +02:00

Changed status to: 'Open'

Morten Mikkelsen commented

2011-10-28 20:00:17 +02:00

%%%I need to clarify a few of my comments I see.

So the first test-case is tiff16_fail.blend and I forgot to mention that after I check 16 bit tiff I hit F12 to render the image and then choose "save image as" but perhaps this is obvious when looking at the scene.

The second scene is save_test.blend but it's really just as simple as opening blender. Entering the UV editor, Open Image and pick the png file read_png_ver.png
and then save out as exr as BW (input image is also single channel) and then finally save the blend.
The resulting exr will have only 256 different levels eventhough the png has many more. If I do the same test using the tiff version of the image then I get all my levels.

%%%

%%%I need to clarify a few of my comments I see. So the first test-case is tiff16_fail.blend and I forgot to mention that after I check 16 bit tiff I hit F12 to render the image and then choose "save image as" but perhaps this is obvious when looking at the scene. The second scene is save_test.blend but it's really just as simple as opening blender. Entering the UV editor, Open Image and pick the png file read_png_ver.png and then save out as exr as BW (input image is also single channel) and then finally save the blend. The resulting exr will have only 256 different levels eventhough the png has many more. If I do the same test using the tiff version of the image then I get all my levels. %%%

Andy Davies commented

2011-10-28 20:11:03 +02:00

%%%Confirmed the 8bit tiff issue on Windows 64bit Blender 2.60a (r41226)

Windows 7 64bit SP1
12gb Ram
Nvidia GTX 460 (285.62)

%%%

%%%Confirmed the 8bit tiff issue on Windows 64bit Blender 2.60a (r41226) Windows 7 64bit SP1 12gb Ram Nvidia GTX 460 (285.62) %%%

Bastien Montagne commented

2011-10-30 14:16:37 +01:00

%%%I attached a patch for the first part (saving 16bit TIFF – and other file formats options as well, like half exr or Jpeg2000 options, btw). But even if it (seems to) do(es) the trick, it’s unlikely to get in Blender (ideasman_42 thinks it’s a wrong way to fix it…). At least, it can help waiting for a proper solution.

As for the second point, afaik, Blender never supported 16bit png?%%%

%%%I attached a patch for the first part (saving 16bit TIFF – and other file formats options as well, like half exr or Jpeg2000 options, btw). But even if it (seems to) do(es) the trick, it’s unlikely to get in Blender (ideasman_42 thinks it’s a wrong way to fix it…). At least, it can help waiting for a proper solution. As for the second point, afaik, Blender never supported 16bit png?%%%

Morten Mikkelsen commented

2011-10-30 14:53:13 +01:00

%%%Thanks Bastien does this mean someone else is working on a solution for trunk?

As for 16 bit png it is apparently working (load wise) in the sense that it's loading the colors correctly but just dropping the precision.%%%

%%%Thanks Bastien does this mean someone else is working on a solution for trunk? As for 16 bit png it is apparently working (load wise) in the sense that it's loading the colors correctly but just dropping the precision.%%%

Jon Purington commented

2011-11-02 19:13:26 +01:00

%%%The last build I was able to pass a 16 bit Tiff through Blender with correct precision was 2.56. builds: Windows 32,64 and Mac%%%

Campbell Barton commented

2011-11-03 04:52:08 +01:00

%%%fixed r41483.%%%

Campbell Barton commented

2011-11-03 04:52:08 +01:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2011-11-03 04:52:08 +01:00

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16bit Tiff save broken in Blender 2.60 #29076