C# bitmap.save loses some pixels

Question

I writing a code to color my bitmap image pixels for

int[,] unClusteredImage = new int[367,158];
Bitmap clusteredImage = new Bitmap(367, 158);
for (int row = 0; row < unClusteredImage.GetLength(0); row++)
                        for (int col = 0; col < unClusteredImage.GetLength(1); col++)
                            if (unClusteredImage[row, col] == 0)
                                clusteredImage.SetPixel(row, col, Color.Red);
                            else if (unClusteredImage[row, col] == 1)
                                clusteredImage.SetPixel(row, col, Color.Blue);
                            else if (unClusteredImage[row, col] == 2)
                                clusteredImage.SetPixel(row, col, Color.Green);
                            else if (unClusteredImage[row, col] == 3)
                                clusteredImage.SetPixel(row, col, Color.Yellow);
                            else if (unClusteredImage[row, col] == 4)
                                clusteredImage.SetPixel(row, col, Color.Black);
                            else if (unClusteredImage[row, col] == 5)
                                clusteredImage.SetPixel(row, col, Color.Orange);
                            else if (unClusteredImage[row, col] == 6)
                                clusteredImage.SetPixel(row, col, Color.Lime);
                            else if (unClusteredImage[row, col] == 7)
                                clusteredImage.SetPixel(row, col, Color.Purple);
clusteredImage.Save("test.jpeg");

The problem is that when i save the bitmap using the bitmap.save method I lose some pixels when I open it in paint I noticed that some pixels are not there in the bottom of my image

Which pixels do you lose? Have you tried contacting the local Pixel authorities and had a search party? — Moo-Juice, Mar 09 '14 at 12:47
You are not losing anything. The entire image is always red because `unClusteredImage[row, col] == 0` is always zero. Your rows and columns are reversed, too (at least by name). — LarsTech, Mar 09 '14 at 12:55
no the entire image is not red. but when I open the image using paint I notice that the last few rows are missing with black. — user3398428, Mar 09 '14 at 13:48
Before you save the image you should draw it first to see if your code works ok. If the drawing produces the desired image then the save is the problem — γηράσκω δ' αεί πολλά διδασκόμε, Mar 09 '14 at 17:21

score 3 · Answer 1 · answered Mar 09 '14 at 13:26

3

You are saving the image as JPEG.

JPG format is a lossy compressed file format. This makes it useful for storing photographs at a smaller size than a BMP.

PNG format is a lossless compression file format, which makes it a common choice for use in applications.

I suggest you try to save it in PNG Format, and check the result. And if you don't care about the size you can always save it as Bitmap.

clusteredImage.save("test.png", ImageFormat.Png);

answered Mar 09 '14 at 13:26

Y2theZ

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I tested your code it didn't work. same problem. I also tried the bitmap (bmp) didn't works as well. I can't upload an image to exaplain more due to reputations are not enough. – user3398428 Mar 09 '14 at 13:47
It fixed my issue... Thanks a lot! – Speuline Jun 21 '17 at 15:51

C# bitmap.save loses some pixels

1 Answers1