convert() method which will overlay any per-pixel alpha values over black. If you want to change a 24-bit image to 32-bit or vice versa, use the. However, I did invent a lovely hack to get around this limitation which you can read about here if you are interested. If you would like to blit an image with per-pixel alpha at a faded opacity, that is unfortunately impossible to do directly. Then, when you blit the image, it will be blitted at the faded opacity. a surface you initialized without pygame.SRCALPHA) then you can set the alpha of the whole surface with the set_alpha method. Setting the alpha of imagesIf you have a surface that does not have per-pixel alpha (e.g. Alpha composition is the process by which we combine one or more semi-transparent images into a final non-transparent image for display. After a few embarrassing PyWeek hotfixes I had to send out, I now play it safe and make ALL of my image files lowercase. However when you give your game to someone running on a mac or linux, it will explode and they won't be very happy with you. If your file is called ball.png and you use ('BALL.PNG') it will work if you are on windows. Screen.blit(get_image( 'ball.png'), ( 20, 20))īig Scary WarningWindows is not case sensitive when it comes to file names. In this video I will explain the purpose of the convert () and convertalpha () methods I will explain what the two methods do, what. This module will only be functional when pygame. 5.7K views 1 year ago PyGame - Misc Tutorials. Functions to convert between NumPy arrays and Surface objects. Write a function, that can convert a cv2 pygame.image image. Gets the array system types currently supported. Surface = pygame.Surface(image.Canonicalized_path = path.replace( '/', os.sep).replace( '\', os.sep) nvertalpha(Surface): return Surface nvertalpha(): return Surface change the pixel format of an image including per pixel alphas, source. However, if you create a new surface and use convertalpha(), the alpha. In code, it translates roughly to: import pygame The converted Surface will have no pixel alphas. Then, just blit your original image on this intermediary surface, set the global alpha on it (set_alpha) and blitit to your destination surface It is a good idea to convert all Surfaces before they are blitted many times. That colro will render fully transparent when blitting. So, fill your surface with this key color, and set it as the key color for the surface: You won't be able to know witch value won't be in use. In video effects, normaly they use pure green or pure white for that, but youĬan choose any RGB value - if your image is a photo instead of pixel art, You have to: create another surface, with the same size of your image, with depth = 24įill that surface with a color not in use in your image (like 'chroma key'). a newly created Mask object from the given surface. However, if your 'alpha.png' does use transparency itself, and you intend to preserve it, gets trickier! surface pixels alpha value, if the surface is color-keyed this parameter is ignored. That is easy to achieve if your original image (inyour case the 'alpha.png' file) uses no transparency itself - just a matter of: import pygame 32 bit depth), a 'global alpha' value,as set by the surface's set_alpha method will be ignored.įor this 'global' alpha to be used, your source surface must not have per pixel alpha. What happens is that if the surface you are blitting (the source) has alpha pixels values for the pixels itself (i.e. Python) documentation one can find the following: Surface alphas can. It is all documented at - but indeed, short in words or examples. 'global alpha' for a surface is tricky to get done right in Pygame. Your code is a bit convoluted :-) but nonetheless, 'non-per-pixel' - or This allows for the most precise transparency effects, but it also the slowest. Per pixel alphas are different because they store a transparency value for every pixel. A surface alpha of 255 is opaque, and a value of 0 is completely transparent. Window.blit(background, background.get_rect()) The surface alpha value is a single value that changes the transparency for the entire image. To elaborate on how I'm struggling with this, the blurb below is a slightly modified hunk of code from this SO answer, but if you run it, you'll see that 'image' loses it's native alpha, while the alpha of 'image2' never changes! Yuck. I want to display an image with alpha with a specified transparency, but can't figure out how to do it. a surface you initialized without pygame.

Pygame image convert alpha