bugfix [#23406] DPX Images load darker then saved, UI broken.

- a linear float buffer was being created and saved into a non-linear DPX/Cineon file.
- removed the UI since the settings are not used at the moment.

added a utility function IMB_float_profile_ensure(), which returns a float buffer in the requested profile, using the existing if needed or returning an allocated buffer if the profile is different to that of the ImBuf. - Useful this case where the save function has its own linear setting.

release/scripts/ui/properties_render.py

@@ -336,7 +336,10 @@ class RENDER_PT_output(RenderButtonsPanel, bpy.types.Panel):
             col.prop(rd, "jpeg2k_ycc")
 
         elif file_format in ('CINEON', 'DPX'):
+            
             split = layout.split()
+            split.label("FIXME: hard coded Non-Linear, Gamma:1.0")
+            '''
             col = split.column()
             col.prop(rd, "use_cineon_log", text="Convert to Log")
 
@@ -345,6 +348,7 @@ class RENDER_PT_output(RenderButtonsPanel, bpy.types.Panel):
             col.prop(rd, "cineon_black", text="Black")
             col.prop(rd, "cineon_white", text="White")
             col.prop(rd, "cineon_gamma", text="Gamma")
+            '''
 
         elif file_format == 'TIFF':
             split = layout.split()