How Do Software Programs Alter Images By Altering The Binary Code That Is Stored For A Pixel? ?
Posted by benny in FreeWare on November 26th, 2009 | 3 responses
This is about image manipulation so how is removing noise, finding edges and blurring achieved? Please explain in simple terms please!
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3 Responses to “How Do Software Programs Alter Images By Altering The Binary Code That Is Stored For A Pixel? ?”
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All those picture elements have code that describes them: their location and characteristics. So, when you select them with a box or lasso tool, your ruling OUT everything else.
Applying filters and manipulation simply works by comparing all the pixles in the captured areas either to one another or to a formula that represents what the desired pixels SHOULD look like. Edges, for example, are represented by pixels whose neighbors on side side are very much like them, and neighbors on the other that are very different. Pixels falling within a threshold set by you will be highlighted, selected and changed according to whatever tool or filter you are using.
Its all about changing the binary code that represents the pixel you want to catch, and what you want it to look like when conceptually simple but a real challenge to do well.
The answer is very complex, and cannot be explained here (we need a book!)
For each “effect” you want to apply, an image function is used.
For example, “sobel_edge” is a mathematical function that “finds” the edges of an image, “onion_peel” will remove all pixels that are touching each other (think of removing the skin of an onion!)
There are thousands of these functions.
Your best bet is to google for “image manipulation functions”. There are many sites that explain in more details
Try also “sobel edge detection” (2 millions results in Google!):(http://www.pages.drexel.edu/~weg22/edge.…
One note of warning: there is a LOT of maths!
The binary code is shown in the mega pixel and you must look at it.It will then alter images.