Baking and bump texture problem

[sawsrinath]

Hello,

I have two problems with my bump texture.

1. I have baked a simple procedural noise texture(to a 32 bit float image). But, uv seams are visible in render. How can I get rid of it?
   

   
   
   

2. I edited the image little bit in GIMP and when I rendered, the bump looks not smooth. I have attached the edited texture. icicle_bump.zip (1.92 MB)
   

   
   
   

Any help would be greatly appreciated. Thanks.

Best Regards,
Srinath

[sawsrinath]

Any advice?

[JohnVV]

I edited the image little bit in GIMP

that better be the development 2.9.4 version
gimp2.8 dose not handle 32bit float images
and the exr output from baking can be any value from say -20 to +20 or more
and gimp2.9 reads only 0 to 1 , 32 bit values .

your image in the zip is a 8 bit per channel rgb png
it also ONLY has 89 unique tones of gray
( 89 steps covering the 255 possible in a 8 bit image)

bumpmaps are normally a 8 bit gray ( yuck- very BAD idea ) or 16 bit tif image or 32 bit float image

rebake and save as a 32 bit float exr , or a 16 bit tiff
gimp 2.9 or Nip2 can open them
nip2 is better for image data NOT in the 0 to 1 range

you can get nip2 here
http://www.vips.ecs.soton.ac.uk/index.php?title=VIPS
it is a gui to the vips image library

all those “swirls” in the image you posted is the 8 bit STEPPING
there is ONLY 256 tones of gray in a 8 bit image
in a 16 bit there are 65536 tones of gray

from nip or using Gmic

G'MIC - GREYC's Magic for Image Computing: A Full-Featured Open-Source...

you can save the displacement map as a 32 bit image with values from 0 to +1
this is an example of using a 32 bit tiff image as a displacement

or the images here
http://forum.celestialmatters.org/viewtopic.php?f=4&t=741&start=15#p13740

[sawsrinath]

Thank you for the reply. I did’t know about the gimp 2.9. I will look into that. Do you have any idea about how to fix that uv seams problem without texture painting?

Best Regards,
Srinath

[JohnVV]

the issue i see is do to using a 8 bit displacement map

the uv layout looks fine

[sawsrinath]

I baked the bump map to 32 bit float openEXR file but looks the same(I didn’t edit the texture).

[JohnVV]

using this example
https://blenderartists.org/forum/attachment.php?attachmentid=455944&d=1475891459

the 3d data i have on hand is from the Minor Body Ceres from the Dawn spacecraft

in order 32 bit , 16 bit ,8 bit ,and 8 bit with 89 tones ( the image in your zip has 89 tones)
– images are 1920x1080

see the difference in the last two !

[sawsrinath]

I mean the UV seams problem. Bump map look good with openEXR format but the uv seams are still visible. Thanks.