Image processing

Working with non-RAW images

DNG and cam_xyz

Submitted by mio on

Hi,

When processing DNG files, will "libraw" calculate a weighted matrix based on two color matrices, camera calibration matrices, etc.?

When I tried to print out "cam_xyz", the fields are all zeroes. Is there an "end" matrix that reflects the weighted matrix.

Also, when can "float cmatrix[3][4]" be used? what kind of conversion does it apply to?

Thanks a lot!

Mio

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Conversion to gray level

Submitted by richefeu on

Hi,

To perform digital image correlations, I use 2 gray-level images stored in that form (pseudo code):

uint16_t image[dimx][dimy];

I use LibRaw in two ways: (1) self basic demosaicing by computing the mean over 4 raw pixels, or (2) let LibRaw perform a sophisticated demosaicing (with dcraw_process) and convert the resulting rgbg2 to gray levels.

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Asking advice for storing raw files

Submitted by Zds on

I have an image storage problem and what I'm asking here is what approach to take, so I need to explain the problem to know what to ask.. Please bear with me.

So, when I shoot, I almost always take 2-4 shots in burst mode. Technically failed frames are dropped, and in case of static scenes, the remaining ones are often combined together, either via HDR combining (from different exposure values) or ALE (from identical exposure values).

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