StackOverflow2013

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plurals

PO
primarykey
Id
2265990
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
6
CommunityOwnedDate
CreationDate
2010-02-15T12:50:51.307
FavoriteCount
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2016-12-01T08:55:04.363
LastEditDate
2016-12-01T08:55:04.363
LastEditorUserId
1664231
OwnerUserId
175216
ParentId
2265910
PostTypeId
2
Score
59
ViewCount
0
LastEditorDisplayName
text
Body
<blockquote> "I want a Bitmap d, that is grayscale. I do see a consructor that includes System.Drawing.Imaging.PixelFormat, but I don't understand how to use that." </blockquote> Here is how to do this <pre><code>Bitmap grayScaleBP = new System.Drawing.Bitmap(2, 2, System.Drawing.Imaging.PixelFormat.Format16bppGrayScale); </code></pre> EDIT: To convert to grayscale <pre><code> Bitmap c = new Bitmap("fromFile"); Bitmap d; int x, y; // Loop through the images pixels to reset color. for (x = 0; x < c.Width; x++) { for (y = 0; y < c.Height; y++) { Color pixelColor = c.GetPixel(x, y); Color newColor = Color.FromArgb(pixelColor.R, 0, 0); c.SetPixel(x, y, newColor); // Now greyscale } } d = c; // d is grayscale version of c </code></pre> Faster Version from <a href="https://web.archive.org/web/20130111215043/http://www.switchonthecode.com/tutorials/csharp-tutorial-convert-a-color-image-to-grayscale" rel="noreferrer">switchonthecode</a> follow link for full analysis: <pre><code>public static Bitmap MakeGrayscale3(Bitmap original) { //create a blank bitmap the same size as original Bitmap newBitmap = new Bitmap(original.Width, original.Height); //get a graphics object from the new image Graphics g = Graphics.FromImage(newBitmap); //create the grayscale ColorMatrix ColorMatrix colorMatrix = new ColorMatrix( new float[][] { new float[] {.3f, .3f, .3f, 0, 0}, new float[] {.59f, .59f, .59f, 0, 0}, new float[] {.11f, .11f, .11f, 0, 0}, new float[] {0, 0, 0, 1, 0}, new float[] {0, 0, 0, 0, 1} }); //create some image attributes ImageAttributes attributes = new ImageAttributes(); //set the color matrix attribute attributes.SetColorMatrix(colorMatrix); //draw the original image on the new image //using the grayscale color matrix g.DrawImage(original, new Rectangle(0, 0, original.Width, original.Height), 0, 0, original.Width, original.Height, GraphicsUnit.Pixel, attributes); //dispose the Graphics object g.Dispose(); return newBitmap; } </code></pre>
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Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POConvert an image to grayscale
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 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USThraka
UserOwnerUserId
1. USAsad Butt
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PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. POConvert an image to grayscale
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PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
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 PO
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 This table or related slice is empty.
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2. VO
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3. VO
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 This table or related slice is empty.
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