how does photoshop enlarge photos?

Q: In photographic material (after scanning at 24bits) or in created artwhich has effects like gradients etc(24 bit), each pixel is a 24bitpixel. This can be seperated into, for example, R, G and B channelsand each channel seperately viewed.The question is whether when an image is enlarged, say to 100 timesits size, will each original pixel become transformed into a largechunky glob (100 x 100 of the original pixel) or will photoshopintelligently enlarge it so that there are no 'globs'. For example,will a simple linear gradient remain the same (except for total size) even after getting enlarged by a factor of 1000 or will it becomegranular?

A: To answer your question, you first need to understand the differencebetween bitmap-based graphics and vector-based graphics. Inbitmap-based graphics each pixel is saved with an RGB value. This iscurrently the most common form of graphics editors. Vector basedgraphics instead use math formulas to represent shapes and objects. Because they consist of points and objects rather than pixels on agrid, vector-based graphics are free from the confines of pixelresolution.You can read more about the difference between the two types of imageeditors here: http://graphicssoft.about.com/cs/findsoftware/a/twotypes.htmMore and more graphics programs are blending the features of bothbitmap-based image editing software and vector-based software. Thisis exactly where Photoshop is right now. When Photoshop enlarges animage, it will first use vector based technology if available,otherwise it will enlarge it using a standard resize matrix. Afterenlarging the image it may adjust the image or apply other effectssuch as blur to hide the distortion.I'm sorry that I don't know more specifics about Photoshop. I don'tuse the program much. Let me know if I can clarify anything and Ihope this helps at least a little! Josh Fraser

Thanks Josh :) at http://answers.google.com/answers/threadview?id=384608

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