![]() Images that are only grey scale are handled faster than color images which have three color channels. Images are categorized into one of three pixel types: grey scale, color, and integer (sometimes called raw, these were derived from a special data acquisition process). CImage::GetBits() can be used to return a pointer to the first pixel (top-left pixel) and then subsequent pixels are accessed by simply incrementing the pointer in a single for-loop. Once in top-down mode, pixel manipulations are made much simpler. However, this can be inconvenient for accessing pixels, so the image is reformatted into a top-down (origin at top-left corner) DIB and 32 bit (since most display adapters are now true color). The CImage member function CImage::Load reads the image file into a bottom-up (origin at lower-left corner of image) device-independent bitmap (DIB). Imagr also has the capability of opening pcx type images (thanks to Roger Evans for the original code), certain ASCII text images, and certain “raw” binary type images. ![]() ![]() The application, called Imagr (spelled without an “e” for historical reasons), is built as a MFC multi-document interface and utilizes the Microsoft ATL CImage class, since it already has the built-in capability for opening and saving images in the most popular formats (bmp, jpg, tif, gif, and png). This article will describe C++ code that was developed for a MFC multi-document interface (MDI) image processing application. Some of these enhance the image’s display in various ways or remove noise. Some basic image processing functions involve manipulation of the pixels using filters or histogram based functions that modify the pixel distribution.
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