add initial gamma support

1 files changed, 40 insertions, 11 deletions

diff --git a/src/pnmlcms.c b/src/pnmlcms.c
index 5c14d44..41b3047 100644
--- a/src/pnmlcms.c
+++ b/src/pnmlcms.c
@@ -6,13 +6,14 @@ pam_transform(struct pam *inpam, struct pam *outpam, cmsHTRANSFORM *hTransform);
 
 int
 main(int argc, char **argv) {
-	int c;
+	int c, i, nProf = 0;
 	char *in_prof = NULL, *out_prof = NULL;
+	double gamma = 0.0;
 	cmsHTRANSFORM hTransform;
-	cmsHPROFILE hInProfile, hOutProfile;
+	cmsHPROFILE profiles[3];
 	struct pam inpam, outpam;
 
-	while ((c = getopt(argc, argv, "i:o:")) != EOF) {
+	while ((c = getopt(argc, argv, "i:o:g:")) != EOF) {
 		switch (c) {  
 			case 'i':
 				in_prof = optarg;
@@ -20,20 +21,46 @@ main(int argc, char **argv) {
 			case 'o':
 				out_prof = optarg;
 				break;
+			case 'g':
+				gamma = atof(optarg);
+				break;
 			default:
 				break;
 		}
 	}
 
-	hInProfile  = cmsOpenProfileFromFile(in_prof, "r");
-	hOutProfile = cmsOpenProfileFromFile(out_prof, "r");
 
-	hTransform = cmsCreateTransform(hInProfile,
+	if (in_prof) {
+		profiles[nProf++] = cmsOpenProfileFromFile(in_prof, "r");
+	} else {
+		profiles[nProf++] = cmsCreate_sRGBProfile();
+	}
+
+	if (gamma) {
+		LPGAMMATABLE gTable[3];
+
+		gTable[0] = cmsBuildGamma(256, gamma);
+		gTable[1] = gTable[2] = cmsBuildGamma(256, 1.0);
+
+		profiles[nProf++] = cmsCreateLinearizationDeviceLink(
+			icSigLabData,
+			gTable);
+	}
+
+	if (out_prof) {
+		profiles[nProf++] = cmsOpenProfileFromFile(out_prof, "r");
+	} else {
+		profiles[nProf++] = cmsCreate_sRGBProfile();
+	}
+
+
+	hTransform = cmsCreateMultiprofileTransform(
+		profiles,
+		nProf,
 		TYPE_RGB_16,
-		hOutProfile,
 		TYPE_RGB_16,
-		INTENT_PERCEPTUAL, 0);
-
+		INTENT_PERCEPTUAL,
+		0);
 	
 	pm_init(argv[0], 0);
 
@@ -46,8 +73,10 @@ main(int argc, char **argv) {
 	pam_transform(&inpam, &outpam, &hTransform);
 
 	cmsDeleteTransform(hTransform);
-	cmsCloseProfile(hInProfile);
-	cmsCloseProfile(hOutProfile);
+	
+	for (i = 0; i < nProf; i++) {
+		cmsCloseProfile(profiles[i]);
+	}
 
 	return 0;
 }