uncleflo
Registered since September 28th, 2017
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How To Make Sense Of The .bmp Format - C++ Tutorials | Dream.In.Code
Saved by uncleflo on March 15th, 2012.
I would read up on using structs in C++ if you do not know how to use them. This is important for this tutorial. .bmp files (Windows BMP) commonly come in 8-bit or 24-bit formats. Working with 8-bit images can actually be difficult so I will cover 24-bit bitmaps in this tutorial since they are easier to understand (and look nicer too :) ). The first thing you should always do when handling a program that uses Windows is to include the windows.h header.
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C++ Tips & Tricks: Bitmap Tutorial: Loading and Saving Bitmaps
Saved by uncleflo on March 15th, 2012.
The windows bitmap file format (.bmp) is the most widely used image file format on windows (next to .jpg), and there are many occasions a program or game has to be able to load or save bitmaps ( raytracers and other non-realtime renderers should be able to save their output in .bmp format, games might have to load them as textures etc. ).
Unfortunately .bmp files are not as straightforward as for example .png image files and provide quite a problem for newbies since it's not that easy to figure out how to use them when without a library or API.
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The PBM Format
Saved by uncleflo on March 11th, 2012.
The PBM format is a lowest common denominator monochrome file format. It serves as the common language of a large family of bitmap image conversion filters. Because the format pays no heed to efficiency, it is simple and general enough that one can easily develop programs to convert to and from just about any other graphics format, or to manipulate the image.
The name "PBM" is an acronym derived from "Portable Bit Map."
This is not a format that one would normally use to store a file or to transmit it to someone -- it's too expensive and not expressive enough for that. It's just an intermediary format. In it's purest use, it lives only in a pipe between two other programs.
The format definition is as follows.
A PBM file consists of a sequence of one or more PBM images. There are no data, delimiters, or padding before, after, or between images.
PBM, PGM, PNM, and PPM: Summary from the Encyclopedia of Graphics File Formats
Saved by uncleflo on March 11th, 2012.
The Portable Bitmap Utilities (PBM) is a collection of programs organized, maintained, and primarily written by Jef Poskanzer. Although owned and copyrighted by Mr. Poskanzer, they are freely available in both source and executable form on the Internet and on many BBS systems. The "bitmap" in PBM is used in the older sense to refer to monochrome images. There are actually three other sets of programs encompassed by the PBM utilities. These are the Portable Greymap Utilities (PGM), the Portable Pixmap Utilities (PPM), and the Portable Anymap Utilities (PNM). PBM programs manipulate monochrome bitmaps, and PGM and PPM programs manipulate gray-scale bitmaps and color bitmaps, respectively. PNM programs operate on all of the bitmaps produced by the other programs. There is no file format associated with PNM itself. Most people call the overall set of programs PBM and the newer version pbmplus, however, and we'll follow this convention.
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Anders' Mindstorms page - Mindstorms NXT Image Scanner
Saved by uncleflo on March 11th, 2012.
The NXT image scanner is a "stand alone" scanner that can scan and save images as a BMP-file in the NXT's flash memory. Images can be saved in either 24-bit true color, 8-bit color or gray scale. Gray scale images are scanned using the light sensor whereas color images are scanned using the HiTechnic color sensor. The scanner has a small LCD menu that let's you set the properties for the scan. Obviously the NXT image scanner is based on experience from my RCX scanner. Where the RCX scanner would take forever to scan even a small image the NXT scanner is much faster and the end result is to my own surprise improved. At the bottom of the page you will find building instructions and program for building your own image scanner.
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