Color Management: various improvements and fixes for image saving

* Respect the image file color space setitng for saving in various cases where
  it was previously ignored. Previously it would often use the sRGB or Linear
  color space even when not selected.
* For the Save As operator, add a Color Space option in the file browser to
  choose the color space of the file. Previously this was chosen automatically,
  now it's possible to e.g. resave a Linear image as Linear ACES.
* When changing the file format, the colorspace is automatically changed to an
  appropriate color space for the file format. This already happened before, but
  there was no visibility or control in the operator settings for this.
* Don't change color space when using the Save operator to save over the same
  file.
* Fix missing color space conversion for 16 bit PNGs, where it assumed wrongly
  assumed ibuf->rect would be used for saving. Add BKE_image_format_is_byte to
  more accurately test this.

Fixes T74610

Ref T68926

Differential Revision: https://developer.blender.org/D14899

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_image_save.h b/source/blender/blenkernel/BKE_image_save.h
index f5695eb11a4..673a7dffb82 100644
--- a/source/blender/blenkernel/BKE_image_save.h
+++ b/source/blender/blenkernel/BKE_image_save.h
@@ -35,6 +35,10 @@ typedef struct ImageSaveOptions {
   bool save_copy;
   bool save_as_render;
   bool do_newpath;
+
+  /* Keep track of previous values for auto updates in UI. */
+  bool prev_save_as_render;
+  int prev_imtype;
 } ImageSaveOptions;
 
 bool BKE_image_save_options_init(ImageSaveOptions *opts,
@@ -44,6 +48,7 @@ bool BKE_image_save_options_init(ImageSaveOptions *opts,
                                  struct ImageUser *iuser,
                                  const bool guess_path,
                                  const bool save_as_render);
+void BKE_image_save_options_update(struct ImageSaveOptions *opts, struct Image *ima);
 void BKE_image_save_options_free(struct ImageSaveOptions *opts);
 
 bool BKE_image_save(struct ReportList *reports,