Scaling and image. prefered algo

[Quell]

Hello.
I was doing some image scaling, and i was using box filter and some other ones to scale, but i was wondering what are some algorithms that give u high qaluity scaling of an image?
I checked stuff out such as box filter, billinear filters, gaussian, blackman filters and some other ones.
I just want an opinion on what are the best ones are to give you highest quality of minification and magnification of images.
Thx

[JohnyDog]

It depends on whether youre downscaling or upscaling, at the type of image (photo, lineart/pixelart texture) and purpose (for printing, for viewing, for mipmap generation) .. good general-purpose algo is Lanczos (slow) or bicubic (faster), but for upscaling you'll have to use some edge-adaptive algo. Usually it is best to stick with bicubic unless you know that other algo will give better results.

[Quell]

thx alot, i am checking out the bicubic algo.