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Questions tagged [hdrimages]

36 questions
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Cannot write to Z channel using OpenEXR

I'm trying the read/write examples in the following official documentation: ReadingAndWritingImageFiles.pdf But I can't write to the Z channel. The image is all black in exrdisplay(the official EXR viewer) even the exposure is max. If I replace 'Z'…
chaosink
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Is there a workflow for using an HDR image for an irradiance map?

For Metal on iOS is there a workflow for using an HDR image - .hdr or .exr format - for an irradiance map?
dugla
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Writing a float image in openCv with pixel values bigger than 1

I am currently working on a program which should take an LDR images and multiply certain pixel in the image, so that their pixel value would exceed the normal 0-255 (0-1) pixel value boundary. The program i have written can do so, but I am not able…
Kristian Moesgaard
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Format of High-Dynamic Range (HDR) images and how to process them?

I have some questions regarding High-Dynamic Range (HDR) images. First, can somebody please tell me about how these images are stored, I mean in which format? and how many bits per pixel? Second, is it possible to store these kind of images in a…
Sanchit
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Reinhard tone-mapping 2002

I'm reading the paper by Erik Reinhard et al. called "Photographic Tone Reproduction for Digital Images", it's also here: http://www.cs.utah.edu/~reinhard/cdrom/ There is this equation #4: Ld(x,y) = L(x,y)(1 + L(x,y)/L_white^2) / (1 + L(x,y)) "[If]…
Tuom L.
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Low-resolution -images or poor blurry images into one precise photo? Algorithms? Linear programming?

Suppose only 1MB camera that will result into somewhat readable photos of written text. Now HDRI is able to remove shadows and make photos sometimes better than alone. My friend said that in the future it will be possible to make blurry or even…
hhh
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Convert HDR image to LDR per pixel in Javascript

I have an HDR image (environment map) and I want to convert it in Javascript to an LDR image that looks good on screens. I'm able to open the HDR and read it pixel by pixel, but I don't know how to convert it to LDR correctly. I tried Reinhard's…
Tiberius
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How to draw a 10-bit color array by ID2D1DeviceContext::DrawImage or ID2D1DeviceContext::DrawBitmap?

I am trying to draw something 10-bit pixel arrays on to the HDR canvas but failed. I add my codes base on https://github.com/vesa-org/DisplayHDRTest The code is inserted into Game::GenerateTestPattern_CalibrateMaxFullFrameValue I could judge from…
Eviluess
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A grayscale gradient image on an HDR10 monitor seems "whiter" or lighter than that in SDR mode

I'm trying to display 10-bit grayscale images on an HDR10 monitor. A Windows app was implemented by DirectXTK: Using HDR rendering (which is based on Direct3D 11). For the purpose of comparison between HDR and SDR, I also duplicated the same app but…
stanley76726
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DirectXTex : generateMipmap with HDR RGBA32f texture clamp value to 1.0f

I'm trying to generate mip map chain from an .exr HDR image with the DirectXTex function DirectX::GenerateMipMaps(). But the result have all pixel clamped to 1.0f. The source image have some to pixel superior to 30.0f, but after the mimap generation…
flob
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Unhandled exception while creating HDR image in OpenCV

Using the code below, I am trying to create a HDR image using 3 images shot with different exposure values. The IDE used is Visual Studio 2013. #include #include #include using namespace…
Prashant Pandey
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How to get the exposure time of a camera when an images is clicked using opencv?

Is it possible to get the exposure time of a camera when a photo is clicked. In opencv at the time of video it can be set and get using CV_CAP_PROP_EXPOSURE in Capture property function. But in case of images how how we can get it ? Thanks
Javed
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How to create HDR images using opencv

I am using opencv 3.0 version which has support for creating HDR images and trying to produce an HDR image using three images at different exposure. And i found this tutorial of…
Javed
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Set arguments in Xcode 6 OpenCV

I need to load some images and a .txt file from folder in order to create an HDR image with OpenCV 3.0.0 like here. Xcode seems to be linked with OpenCV 3.0.0 as other code samples work, images are loaded when I give the full path. How can I load…
user_3849
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Converting LDR to HDR in OpenCV

I cant seem to find a data structure in opencv which can hold pixel depths greater than 8 bits. My problem is that i would like to take a LDR image and multiply some of the pixels so that these pixel's value would exceed the 255 boundary. This is…
Kristian Moesgaard
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