Fix #31254: OpenGL-Rendering dark without Effect-Strip

Issue was caused by the fact, that sequencer is working in sRGB space, but
when there's only image input strips we need to make sure conversion from
byte to float buffer would keep float buffer in sRGB space and wouldn't
make it linear as it's supposed to be in other areas.

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/editors/render/render_opengl.c b/source/blender/editors/render/render_opengl.c
index a46e3c69456..cfc7ba0537f 100644
--- a/source/blender/editors/render/render_opengl.c
+++ b/source/blender/editors/render/render_opengl.c
@@ -146,6 +146,13 @@ static void screen_opengl_render_apply(OGLRender *oglrender)
 			BLI_assert((oglrender->sizex == ibuf->x) && (oglrender->sizey == ibuf->y));
 
 			if (ibuf->rect_float == NULL) {
+				/* internally sequencer working in sRGB space and stores both bytes and float
+				 * buffers in sRGB space, but if byte->float onversion doesn't happen in sequencer
+				 * (e.g. when adding image sequence/movie into sequencer) there'll be only
+				 * byte buffer and profile will still indicate sRGB->linear space conversion is needed
+				 * here we're ensure there'll be no conversion happen and float buffer would store
+				 * linear frame (sergey) */
+				ibuf->profile = IB_PROFILE_NONE;
 				IMB_float_from_rect(ibuf);
 			}