[gegl] Finer control for preflash in negative-darkroom

[Øyvind "pippin" Kolås <ok src gnome org>]

commit a9f810b8229f727aa511c87bca66588a9e1032a0
Author: JonnyRobbie <marcodv seznam cz>
Date:   Fri Jul 16 11:12:48 2021 +0200

    Finer control for preflash in negative-darkroom

 operations/common/negative-darkroom.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)
---
diff --git a/operations/common/negative-darkroom.c b/operations/common/negative-darkroom.c
index b8bbe328f..0086c567e 100644
--- a/operations/common/negative-darkroom.c
+++ b/operations/common/negative-darkroom.c
@@ -70,17 +70,17 @@ property_boolean (preflash, _("Enable preflashing"), FALSE)
 
 property_double (flashC, _("Red preflash"), 0)
        description(_("Preflash the negative with red light to reduce contrast of the print"))
-       value_range (0, 0.05)
+       value_range (0, 1)
        ui_meta("visible", "preflash")
 
 property_double (flashM, _("Green preflash"), 0)
        description(_("Preflash the negative with green light to reduce contrast of the print"))
-       value_range (0, 0.05)
+       value_range (0, 1)
        ui_meta("visible", "preflash")
 
 property_double (flashY, _("Blue preflash"), 0)
        description(_("Preflash the negative with blue light to reduce contrast of the print"))
-       value_range (0, 0.05)
+       value_range (0, 1)
        ui_meta("visible", "preflash")
 
 property_boolean (illum, _("Illuminant adjustment"), FALSE)
@@ -283,14 +283,14 @@ process (GeglOperation       *operation,
                z = 0.00092090*in[0] - 0.0025498*in[1] +  0.17860*in[2];
 
                // Apply preflash
-               x = x + o->flashC;
-               y = y + o->flashM;
-               z = z + o->flashY;
+               x += o->flashC / 100;
+               y += o->flashM / 100;
+               z += o->flashY / 100;
 
                // Apply color filters and exposure
-               x = x * rcomp * exp;
-               y = y * gcomp * exp;
-               z = z * bcomp * exp;
+               x *= rcomp * exp;
+               y *= gcomp * exp;
+               z *= bcomp * exp;
 
                // Simulate emulsion spectral sensitivity with
                // sensitivity matrix
@@ -331,9 +331,9 @@ process (GeglOperation       *operation,
                /*printf("Raw RGB density %f %f %f\n", r, g, b);*/
 
                // Apply density boost
-               r = r * o->boost;
-               g = g * o->boost;
-               b = b * o->boost;
+               r *= o->boost;
+               g *= o->boost;
+               b *= o->boost;
 
                // Compensate for fog
                r -= Dfogc;