resizing vs. cropping

[Bienentanz]

I've just read an old tread about cropping but it's still not clear what they're actually saying. Does cropping mean - in the sense of Photoshop - that pixels or lines are deleted without resizing or distorting the picture? Is it possible to do this (I'm looking for a tool)? Or does it just mean enlarging the frames to get rid of the black at top or bottom - and a bit of the proper picture left and right?

[khp]

Re: resizing vs. cropping

Originally posted by Bienentanz
...Does cropping mean - in the sense of Photoshop - that pixels or lines are deleted without resizing or distorting the picture?

Well yes, but because some video codecs such as divx must encode at resolutions that are divisible 16 in both width and hight you might have to resize the chopped image. In virtualdub you chop by using the null transform filter and then resize to make the resolution fit. Other programs such as flask will only let u chop to a resolution that fits.

[setarip]

"Does cropping mean - in the sense of Photoshop - that pixels or lines are deleted without resizing or distorting the picture? Is it possible to do this (I'm looking for a tool)? Or does it just mean enlarging the frames to get rid of the black at top or bottom"

In photography/videography (digital and otherwise), cropping continues to mean removing vertical or horizontal lines of an image (rows or columns of pixels) without altering the remaining image.

Resizing refers to altering the resolution of an image - which may or may not distort it. If the proportion of the new resolution remains equal to that of the original, there will be no distortion (e.g. 720:480 to 360:240). This, of course, has nothing to do with quality of image, such as blockiness, etc.