Forum

Author Topic: EXR vs BMP panoramas  (Read 2991 times)

uop360

  • Newbie
  • *
  • Posts: 18
    • View Profile
EXR vs BMP panoramas
« on: July 08, 2014, 09:44:03 PM »
Hello,

I am new in this forum.
I created an interior of a room using spherical images and I tried to import EXR (32bit) images and compare my results with BMP (8bit). I noticed that 3d textured model created using EXR is too bright and the total error is 1.3cm whereas in the case of 8bit BMP files the textured 3d model is too dark and the total error is 1.6cm. So the difference is small, but I get better visual results with 8bit images. I noticed that Photoscan found about 350 more points (out of approx. 100 000)in the case of EXR files.

Is it worth using EXR (HDR) files?

Is it better to create tone mapped panoramas rather than use EXR?

I created EXR in Photoshop where I saved HDR files into EXR.

I am waiting for your help.
Karl

uop360

  • Newbie
  • *
  • Posts: 18
    • View Profile
Re: EXR vs BMP panoramas
« Reply #1 on: July 14, 2014, 11:09:16 AM »
any idea?

David Cockey

  • Full Member
  • ***
  • Posts: 207
    • View Profile
Re: EXR vs BMP panoramas
« Reply #2 on: July 14, 2014, 02:40:09 PM »
The difference in the appearance of the images is because the 32 bit EXR images do not have any gamma adjustment which is standard for images in 8 bit and 16 bit BMP, JPEG and TIFF formats.

Tonemapping the EXR images to a 8 bit or 16 bit format will make them look normal.