I modified the value of user_sat from -ve to +ve, however the effect is weird. -ve values do not cause any effect on the image while positive values do not cause obvious effect. The +ve values, for an extreme effect, say 9000, only make the image being darker and more red.

I am wondering the usage of user_sat here. Should modifying saturation can make the image change from a black and white image to a very deep colored image?? It's because I see other image processing software is working like this when adjusting the saturation.

I'm using LibRaw 0.15.0-Beta4.

Hi together,

I noticed that libraw outputs RGBA-Color when I set output_color to "raw" and half_size = true.

Is that intended behaviour or a bug? When I change one of these, output is RGB.

Regards
Andreas

Hello, Im working on project making HDR photo out of RAW images by making 3 samples with different exposures. Overexposing the image by setting values exp_shift between 2.0 and 8.0 works great but the underexposing values just arn't working. Setting them to 0.5 or 0.25 and it makes no difference on the result between it and input image.
Normal process - unpack(), dcraw_process(), dcraw_make_mem_image()

Hello,

i actually try to load a RAW file created by the Nikon Coolscan 4000 Scanner.
Its a .nef file, original resolution 5408x3571 px, but i receive a wrong resultion and no image data.

Is it possible, that the Nikon Coolscan 4000 Raw files are not supported? (.nef is supported, but maybe the coolscan 4000 files are somehow special)

Thanks for your time,

Michael

I am writing a GUI interface with C++ and I would like to make the LibRaw processor (i.e. LibRaw Processor = LibRaw();) to be global so that I can use it in any functions and pass it between other forms.
I've tried:

private:
LibRaw Processor1;

it turns out "error C4368: cannot define 'Processor1' as a member of managed 'RAW_GUI::Form1': mixed types are not supported"

And I tried to make it as a pointer:

private:
LibRaw *Processor1;

However I cannot run Processor1 = LibRaw(); as it cannot convert LibRaw * to LibRaw.