Hi
I would like the create a script which gives me the rbga value of a pixel that I pick in the Image Editor.
I’m looking to do something like when I clic in the Image Editor with the left mouse, it returns me a list with the rbga value of the pixel I pick and launch a function in the script for exemple. Is it possible to do that?
Thank you!!
there’s a stock color picker you could use for this, but well, if you want to code it yourself:
import bpy
class ModalDrawOperator(bpy.types.Operator):
"""Draw a line with the mouse"""
bl_idname = "view3d.modal_operator"
bl_label = "Simple Modal View3D Operator"
def modal(self, context, event):
context.area.tag_redraw()
if event.type == 'LEFTMOUSE':
mouse_x = event.mouse_x - context.region.x
mouse_y = event.mouse_y - context.region.y
uv = context.area.regions[-1].view2d.region_to_view(mouse_x, mouse_y)
img = context.area.spaces[0].image
size_x, size_y = img.size[:]
x = int(size_x * uv[0]) % size_x
y = int(size_y * uv[1]) % size_y
offset = (y * size_x + x) * 4
pixels = img.pixels[offset:offset+4]
self.report({'INFO'}, "Color: %.3f %.3f %.3f %.3f (RGBA)" % pixels)
# Overwrite pixel (for testing purposes):
#img.pixels[offset:offset+4] = (1,1,1,1)
return {'FINISHED'}
elif event.type in {'RIGHTMOUSE', 'ESC'}:
return {'CANCELLED'}
return {'RUNNING_MODAL'}
def invoke(self, context, event):
if context.area.type == 'IMAGE_EDITOR':
context.window_manager.modal_handler_add(self)
return {'RUNNING_MODAL'}
else:
self.report({'WARNING'}, "UV/Image Editor not found, cannot run operator")
return {'CANCELLED'}
def register():
bpy.utils.register_class(ModalDrawOperator)
def unregister():
bpy.utils.unregister_class(ModalDrawOperator)
if __name__ == "__main__":
register()
Use spacebar menu over image editor and search for the modal operator, then left-click on a pixel. You might need to add checks in case there’s no image or something like that.
Thank you for the script! I think that is exactly what I need.
I don’t want to code a color picker from scratch but the color picker of Blender clamps the values greater than 1 and smaller than 0. And that’s a problem for the tools I’m working on.
Indeed, I probably make a mistake when I tried to sample the colors greater than 1. Anyway, I also need to sample values smaller than 0 and your script helps me a lot.
Thanks.
