sprites filed with ,,strange-shaped textures,,

[CreaM]

hello, im filling sprites with textures - for example with image of ball. When i transfer it to texture and then use this texture for sprite... the sprite wont be just ball, but ball on some square white background (background of image i used)...
so how can i make sprite to ignore background of its image? - have i define all points i want to ignore? - cant i just tell sprite to ignore some colors of its texture? what about sprite of ring (transparent in middle)- for example.

[Ixrec]

That's because your image has white pixels, not transparent pixels.  You don't need to do anything special to make transparency work in SFML if the image file already has transparent pixels.

If you don't know how to make an image with transparency, that's probably because the default Windows Paint program can't do it.  A better program like Paint.net makes it easy.

[G.]

Well, don't use a white background on your image, use a transparent one... (png)
Alternatively, use sf::Image::createMaskFromColor