How do I. Convert images to grayscale and sepia tone using C The Microsoft. NET Framework provides developers with many different libraries that enable them to create and modify images. In this How do I. Zach Smith demonstrates two methods for converting an image to grayscale and sepia tone using built in. NET Framework functionality from C. Before we dive into the code, we need to look at the algorithms used to determine how to convert the image. ISO-12233_ext_wedges_16_9_sRGB.png' alt='Grayscale Test Chart Pdf' title='Grayscale Test Chart Pdf' />Each algorithm will take a color as input and then calculate the resultant color. For grayscale this is relatively easy. You simply calculate the brightness of the color and use that value to create a shade of gray. A very basic implementation of this is shown in Listing A. Note The Tech. Republic PDF download version of this blog post includes a Visual Studio project file will all of the code and libraries mentioned. Listing Aoutput. Color input. Red input. Green input. Blue 3. You then set all three RGB values equal to output. Color. Sepia tone is a little more complex because we are no longer working in shades of gray, and we cannot rely on the average of the other colors for our output color. For sepia tone, we will use a calculation similar to the one shown in Listing B. Listing Boutput. Red input. Test Charts creates test chart files for printing on high quality inkjet printers. This page focuses on Scalable Vector Graphics SVG charts, most of which are used. PDFXChange Product Comparison Chart find the PDF related software product you need with this handy, comprehensive product feature comparison chart. In photography, computing, and colorimetry, a grayscale or greyscale image is one in which the value of each pixel is a single sample representing only an amount of. For a full listing of computers color palettes, see List of palettes. This list of monochrome and RGB palettes includes generic repertoires of colors color palettes. Red. 3. 93 input. Green 7. 69 input. The code above converts an image to grayscale using the ColorMatrix method. As you can see, it does not use the simple algorithm of RGB3 to convert the image. Matplotlib Examples Release 2. Date May 10, 2017 animation Examples. Blue. 1. 89. output. Green input. Red. Green 6. 86 input. Blue. 1. 68. output. Blue input. Red. Green 5. Blue. 1. 31. If any of these output values is greater than 2. These specific values are the values for sepia tone that are recommended by Microsoft. The following examples are two of the more common approaches used to convert images to grayscale or sepia tone. While there are other ways to achieve the same result, these two methods do not use unsafe code blocks or external calls to Windows APIs techniques some other approaches use. Because of this, these two solutions are cleaner and easier to adapt. The first method of conversion. The first method of conversion is the Set. Pixel method. To do this we create a Bitmap and loop through every pixel of the Bitmap, stopping at each one to calculate the color we want to change it to. Then, we call Bitmap. Set. Pixel to change the pixel to our desired color. An example of this method is shown in Listing C. Listing Cprivate void btn. GrayscaleClickobject sender, Event. Args e. Get the image from our Picture. Box. Bitmap gray. Scale Bitmappic. Original. Image. Clone Store the heightwidth of the imageint height gray. Scale. Size. Height int width gray. Scale. Size. Width Loop through both the Y vertical and X horizontal coordinates of the image. Coordinate 0 y. Coordinate lt height y. Coordinatefor int x. Coordinate 0 x. Coordinate lt width x. CoordinateGet the pixel thats at our current coordinate. Color color gray. Scale. Get. Pixelx. Coordinate, y. Coordinate Calculate the gray to use for this pixel. Color color. R color. G color. B 3 Set the pixel to the new gray color. Scale. Set. Pixelx. Coordinate, y. Coordinate, Color. From. Argbgray. Color,gray. Color,gray. Color Set the modified Picture. Box to our new image. Modified. Image gray. Scale. The example code above was taken from the sample application included with the download version of this blog post. The sample application also includes an example of converting to sepia tone using this Set. Pixel method. The second method of conversion. The second method of conversion is to use an object called a Color. Matrix. You create the Color. Matrix object, obtain a Graphics object from the image you want to convert, create a new Image. Attributes object, which contains the color matrix, and then use the Graphics object to draw the image with the modified attributes. Listing D shows this code in detail, with comments describing what is happening in each step. Listing Dprivate void btn. Matrix. GrayscaleClickobject sender, Event. Args e. Color. Matrix layout Red Result Green Result Blue Result Alpha ResultRed Value. IgnoredGreen Value. IgnoredBlue Value. IgnoredAlpha Value 0 0 0 1This is basically saying that Red should be converted to R G 5. B 1. Green should be converted to R G 5. B 1. Blue should be converted to RG 5. B 1. Alpha should stay the same. Create the color matrix. Color. Matrix matrix new Color. Matrixnew floatnew float 0. Create our image to convert. Image image Bitmappic. Original. Image. Clone Create the Image. Attributes object and apply the Color. Matrix. Image. Attributes attributes new Image. Attributes attributes. Set. Color. Matrixmatrix Create a new Graphics object from the image. Graphics graphics Graphics. From. Imageimage Draw the image using the Image. Attributes we created. Draw. Imageimage,new Rectangle0, 0, image. Width, image. Height,0,0,image. Width,image. Height,Graphics. Unit. Pixel,attributes Dispose of the Graphics object. Modern Jazz Piano A Study In Harmony And Improvisation Pdf Reader on this page. Dispose pic. Modified. Image image. The code above converts an image to grayscale using the Color. Matrix method. As you can see, it does not use the simple algorithm of RGB3 to convert the image. Instead it uses the same algorithm used by color TVs to display black and white images. Example images. The following are example images created using the sample application included with the download version of this blog post. Figure AOriginal image. Figure BGrayscale image. Figure CSepia tone image.