将图像的像素设置为存储在整数数组中的值 [英] Set the pixels of image to the values stored in an array of integers
本文介绍了将图像的像素设置为存储在整数数组中的值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
namespace txtToImg
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
string fileContent = File.ReadAllText("D:\\pixels.txt");
string[] integerStrings = fileContent.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
int[] integers = new int[integerStrings.Length];
for (int n = 0; n < integerStrings.Length; n++)
{
integers[n] = int.Parse(integerStrings[n]);
}
Bitmap my = new Bitmap(512, 512);
for (int i = 0; i < 512; i++)
for (int j = 0; j < 512; j++)
my.SetPixel(i, j, Color.Blue);
my.Save("D:\\my.jpg");
}
}
}
而不是像我一样将所有像素设置为蓝色,我想使用数组中的值。
Instead of setting all the pixels to Blue as I've done, I want to use the values from the array.
这就是我将像素保存到文本文件的方法!它们是从0到255的整数。现在我正在尝试处理灰度图像,所以我不需要单独使用R,G和B,这就是为什么它(R + G + B)/ 3。
This is how I save the pixels to a text file! They are integers from 0 to 255. Now I'm trying to deal with greyscale images so I don't need the R, G and B separately, that's why it's (R+G+B)/3.
using (Bitmap bitmap = new Bitmap("D:\\6.jpg"))
{
int width = 512;
int height = 512;
TextWriter tw = new StreamWriter("D:\\pixels.txt");
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
Color color = bitmap.GetPixel(j, i);
tw.Write((color.R + color.G + color.B) / 3 + " ");
}
//tw.Write(" ");
}
tw.Close();
}
推荐答案
由于您已经拥有灰度值对于每个颜色1个字节,使用Format8bppIndexed用于新图像是有意义的:
Since you already have grayscale values with 1 byte per color it makes sense to use Format8bppIndexed for new image:
// Create 8 bit per pixel bitmap
var bitmap = new Bitmap(512, 512, PixelFormat.Format8bppIndexed);
// Set grayscale color palette
var colorPalette = bitmap.Palette;
var colorEntries = colorPalette.Entries;
for ( int i = 0; i < 256; i++ )
{
colorEntries[i] = Color.FromArgb(i, i, i);
}
// Apply changes to color pallete
bitmap.Palette = colorPalette;
// Retrieve bitmap data for efficient writes
var bitmapData = bitmap.LockBits(Rectangle.FromLTRB(0, 0, 512, 512), ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);
// Allocate array to store intermediate pixel data
byte[] colorData = new byte[bitmapData.Stride * bitmapData.Height]; // 1 byte per pixel since it is 8bppIndexed format
for (int i = 0; integers.Length; i++)
{
int line = i / 512;
int position = i % 512;
colorData[line * bitmapData.Stride + position] = (byte)integers[i]; // color values from file
}
// Copy computed pixel data to BitmapData
Marshal.Copy(colorData, 0, bitmapData.Scan0, colorData.Length);
bitmap.UnlockBits(bitmapData);
bitmap.Save("D:\\test.bmp");
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