[shotwell] Do not use functions to convert RGB values

[Jens Georg <jensgeorg src gnome org>]

commit f8ee4c16b894e54af8e8b08d7b124442f7e1cb71
Author: Jens Georg <mail jensge org>
Date:   Sun Mar 26 18:50:22 2017 +0200

    Do not use functions to convert RGB values

 src/ColorTransformation.vala |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/ColorTransformation.vala b/src/ColorTransformation.vala
index d1b3fc5..b934443 100644
--- a/src/ColorTransformation.vala
+++ b/src/ColorTransformation.vala
@@ -961,9 +961,9 @@ public class PixelTransformer {
 
                 current_pixel = apply_transformations(current_pixel);
 
-                dest_pixels[i] = current_pixel.quantized_red();
-                dest_pixels[i + 1] = current_pixel.quantized_green();
-                dest_pixels[i + 2] = current_pixel.quantized_blue();
+                dest_pixels[i] = (uchar) (current_pixel.red * 255.0f);
+                dest_pixels[i + 1] = (uchar) (current_pixel.green * 255.0f);
+                dest_pixels[i + 2] = (uchar) (current_pixel.blue * 255.0f);
             }
 
             if ((cancellable != null) && (cancellable.is_cancelled())) {