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Questions tagged [hdrimages]

36 questions
16
votes
3 answers

Which floating-point image format should I use?

In the past I've saved RGB images (generated from physical simulations) as 8-bits/channel PPM or PNG or JPEG. Now I want to preserve the dynamic range of the simulation output, which means saving a floating point image and then treating conversion…
timday
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11
votes
4 answers

HDR image creating algorithm

Do you know any algorithm to create HDR images, like photomatix or photoshop "merge hdr" function?
Milan
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7
votes
2 answers

How does one create and display HDR images in web browsers?

Are there any image formats for the web with full HDR image support? 10/12-bit channels, DCI-P3/Rec.2020 colour space, etc. It seems like none of the conventional formats support it, and no one is talking about it, even when YouTube accepts HDR…
Don Reba
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7
votes
2 answers

How to load *.hdr files using python

I would like to read an environment map in *.hdr file format. It seems that very popular libraries doesn't support .hdr file reading, for example, OpenCV, PIL etc.. So how to read a .hdr file into a numpy array?
Dawei Yang
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4
votes
2 answers

Read, process and show the pixels in .EXR format images

I want to read the exr file format images and see the pixel intensities in the corresponding location. And also wanted to stack them together to give them into a neural network. How can I do the normal image processing on these kind of formats?…
Rajesh
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3
votes
1 answer

Threejs reflection and glossiness issues with ShaderMaterial

I'm trying to develop my own custom glsl shader for threejs but I'm stack on the glossy reflections with HDR images. It works fine with with LDR images, but not with HDR. I started by using this example in order to generate the mipmaps. I then used…
Nick
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3
votes
3 answers

Open Source HDR library recommendations

So I'm doing some research related to High Dynamic Range Imaging (HDRI). I've already done some work in OpenCV related to aligning and ghost removal (no actual HDR manipulation or creation yet), and now I would like to be able to start working with…
SSilk
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3
votes
1 answer

16-bit float data type

Does anyone have any experience with using the 16-bit floating-point type in an application. This relatively new data type is used in computer graphics. It's defined by several specs: OpenEXR, DirectX and the new IEEE-754 2008 standard. At…
Die in Sente
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3
votes
2 answers

Float PPM image file format?

I've found a PPM image with the header starting with PF (instead of standard P6, P5, P4, ... signatures). The resolution number is stored in floating point (-1.000). No comments are inserted to get how it was produced. Because the resolution, I…
Luca
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2
votes
1 answer

Issue enabling HDRI for ImageMagick

I am installing ImageMagick on my server and upon entering the following config command: ./configure --enable-hdri I get an output for the configuration that shows: --enable-hdri=yes yes But, when I try: identify -version Am am…
bradleygriffith
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2
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0 answers

How to apply HDR fillter to image in flutter

I am trying to add HDR filter effect to image in flutter using photofilters: ^3.0.1 library. In this library HDR filter is not available so I try to make custom. What I try class HDRISHFilter extends ColorFilter { HDRISHFilter() : super(name:…
Ali
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2
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0 answers

How to read HDR envi image in the Java (using GDAL or Opencv)?

I have a HDR envi image with 160 bands and this image has 4 GB as size. Each band for each pixel (row, column) has a double value associated (a reflectance value). In addition, each pixel has a geographical point associated. I can read it by using…
Anderson Carniel
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2
votes
1 answer

Custom openEXR read/write methods

So for a project I'm working on I need to be able to read in the rgba data from an openexr hdr image file (and possibly write to them as well). My issue is that the ilmimf library from the openEXR website is quite large and I do not need all of the…
user1855952
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1
vote
1 answer

simple 32bit floatingpoint image format?

What image formats that support 32-bit floating point values (per channel)? I would like to read and write uncompressed 32-bit RGB images in C++ as simply as possible. There is OpenEXR, but it's rather complex and so far I didn't get the open…
Mat
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1
vote
0 answers

Algorithm of HDR viewer of GIMP, Photoshop or anything similiar

I am in search of an algorithm capable of displaying an HDR image on an 8-bit screen. Essentially, I require an algorithm that converts HDR to LDR. Specifically, I am aiming to achieve results comparable to those produced by GIMP or Photoshop. I…
Tiberius
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