uncleflo
Registered since September 28th, 2017
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Tag selected: grayscale.
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Convert color to grayscale
Saved by uncleflo on March 12th, 2012.
Colours in an image may be converted to a shade of gray by calculating the effective brightness or luminance of the colour and using this value to create a shade of gray that matches the desired brightness. The following code snippet isn't really a good example of how it should be done in a production situation but it does show the principles involved clearly. For every day use. see the ColorMatrix example below. The effective luminance of a pixel is calculated with the following formula: Y=0.3RED+0.59GREEN+0.11Blue This luminance value can then be turned into a grayscale pixel using Color.FromArgb(Y,Y,Y). Converting an image from colour to monochrome can be performed using the following code.
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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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