I like to use gdal_contrast_stretch from
http://www.gina.alaska.edu/projects/gina-tools/
Usage: gdal_contrast_stretch <src.tif> <dst.tif>
{ { -linear-stretch <target_avg> <target_stddev> } |
{ -percentile-range <from: 0.0-1.0> <to: 0.0-1.0> } |
{ -histeq <target_stddev> } }
[ -ndv <no_data_val> ]
Input must be either 8-bit or 16-bit. Output is 8-bit.
For example:
gdal_contrast_stretch -percentile-range 0.02 0.98 input16bit.tif
output8bit.tif
Best Regards,
Brent Fraser
On 3/20/2012 9:55 AM, Saâd HESSANE wrote:
Hi list,
I use gdal_translate to convert 16bits images to 8bits images. The
gdal_translate have the -scale argument to specify the convertion
range (source->destination).
If I change the destination range (dst_min and dst_max), I can do
manually a brightness correction (also a contrast correction).
But is there any way to do that with a Photoshop like method?
For example set a brightness to -50, a contrast to +8 and let
gdal_translate do the job ?
Also can I apply a gamma correction?
I saw the VRT format and there's a way to apply a LUT. But I don't
think a LUT of 65536 values is the best way to apply the correction.
Also the VRT have the scale ratio and scale offset elements. I think
it can be useful but I don't understand how use it...
So simply put, my question : can I do a contrast, brightness or gamma
correction to a raster with gdal?
Thank you !
PS : I apologize for my broken English!
_______________________________________________
gdal-dev mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/gdal-dev
_______________________________________________
gdal-dev mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/gdal-dev
