> the execution with 16-bit values says ByteRGB2 is corrupted.
Sure it is,
>unsigned char ByteRGB2[3] = {0, 0, 0};
>TYPE_BGR_16
Unsigned char is 8 bits, BGR_16 is 16 bits, you don't provide enough space
to store 3 x 16 bits result. Use "cmsUInt16Number result[3]" instead;
But anyway, if you want to convert a floating point Lab to floating point
RGB, why not to use TYPE_Lab_DBL and TYPE_RGB_DBL and avoid all conversions?
hTransformLab2Aux = cmsCreateTransform(
hLabProfile,
TYPE_Lab_DBL,
hAuxRGBProfile,
TYPE_RGB_DBL,
INTENT_ABSOLUTE_COLORIMETRIC, 0);
cmsFloat64Number RGB[3];
cmsCIELab Lab = ...;
cmsDoTransform(hTransformLab2Aux, &Lab, RGB, 1);
Hope that helps
Marti
Original Message:
-----------------
From: Rémi CERISE cerise....@gmail.com
Date: Tue, 8 Feb 2011 10:49:48 +0100
To: lcms-user@lists.sourceforge.net
Subject: [Lcms-user] Usage example : transformation LAB_16 to BGR_16
Hello,
I am trying to convert from TYPE_LAB_16 to TYPE_BGR_16 but don't find the
good way to process.
*hTransformLab2Aux = cmsCreateTransform(*
* hLabProfile,*
* TYPE_Lab_16,*
* hAuxRGBProfile,*
* TYPE_BGR_16,*
* INTENT_ABSOLUTE_COLORIMETRIC, 0);*
The two used profiles have previously been created with no errors.
hLabProfile is a simple Lab profile created with cmsCreateLab2Profile.
hAuxRGBProfile is special RGB profile based on the model of
cmsCreate_sRGBProfileTHR function but with different values for primaries.
In order to complete the conversion I used the following line codes :
*unsigned short LabEncoded[3] = {0, 0, 0};*
*cmsFloat2LabEncoded( LabEncoded, &myLab );*
*
*
*unsigned char ByteRGB2[3] = {0, 0, 0};*
*cmsDoTransform(hTransformLab2Aux, LabEncoded, ByteRGB2, 1);*
*
*
*cmsFloat64Number R = ByteRGB2[0];*
*cmsFloat64Number G = ByteRGB2[1];*
*cmsFloat64Number B = ByteRGB2[2];*
If tests in 8-bit (TYPE_LAB_16 to TYPE_BGR_8) values are OK, the execution
with 16-bit values says ByteRGB2 is corrupted. So which type can I use
instead of unsigned char in this case ? Is there a special typedef in lcms
to do that ?
The fact is I am not sure if I am dong right in using TYPE_BGR instead of
TYPE_RGB. Could I have a little example of what I have to do ? It would be
great.
Remi
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