取图片中某一个地方颜色问题

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通点鼠标在图片上点击，同时取得点击图片位置上相应的颜色。
但在操作的过程中，取得图片点的颜色位置有很大的偏差。
图片：

代码：

private void _viewer_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
point = new Point(e.X, e.Y);
Transformer t = new Transformer(DigImageUtils.ToMatrix(ImageViewer.ImageTransform));
point = Point.Round(t.PointToLogical(point));
}

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private void _viewer_Click(object sender, EventArgs e)
{
if(point==Point.Empty)
return;
LeadPoint offset = new LeadPoint(point.X, point.Y);
// Adjust the XOffset and YOffset in case the view perspective is not TopLeft.
offset = ImageViewer.Image.PointToImage(Leadtools.RasterViewPerspective.TopLeft, offset);
rasterColor = ImageViewer.Image.GetPixelColor(offset.X, offset.Y);
ImageViewer.Image.SetPixelColor(offset.X, offset.Y, RasterColor.Black);
txtColor.BackColor = Color.FromArgb(rasterColor.R, rasterColor.G, rasterColor.B);
}

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iceman · iceman

回复 1楼leadcom的帖子

LeadTools 获取特定坐标点可以使用 GetPixelColor 方法，请参考帮助文档：
https://www.leadtools.com/help/l ... ~getpixelcolor.html

关键代码：

[TestMethod]
public void GetPixelColorExample()
{
RasterCodecs codecs = new RasterCodecs();
// Load the image
RasterImage image = codecs.Load(Path.Combine(ImagesPath.Path, "IMAGE1.CMP"));
// Specify a line of pixels.
LeadPoint offset = new LeadPoint(image.Width / 8, image.Height / 8);
int XSize = image.Width / 3;
// Invert the colors of pixels in the line.
for(int i = 0; i < XSize; i++)
{
LeadPoint oldOffset = new LeadPoint(offset.X, offset.Y);
// Adjust the XOffset and YOffset in case the view perspective is not TopLeft.
offset = image.PointToImage(Leadtools.RasterViewPerspective.TopLeft, offset);
RasterColor pixelColor = image.GetPixelColor(offset.Y, offset.X);
pixelColor.R = (byte)(255 - pixelColor.R);
pixelColor.G = (byte)(255 - pixelColor.G);
pixelColor.B = (byte)(255 - pixelColor.B);
image.SetPixelColor(offset.Y, offset.X, pixelColor);
offset = oldOffset; // Restore Offset
offset.X = offset.X + 1;
}
codecs.Save(image, Path.Combine(ImagesPath.Path, "IMAGE1_GetPixelColor.BMP"), RasterImageFormat.Bmp, 0);
image.Dispose();
codecs.Dispose();
}

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leadcom · leadcom

我就是参照这个例子来做的，还是有问题。

iceman · iceman

回复 3楼leadcom的帖子

这个问题我们正在调查中，已经和厂商进行沟通，下周会给您提供一个解决方法。

leadcom · leadcom

怎么样了，大侠，急等着。。

iceman · iceman

回复 5楼leadcom的帖子

需要通过 PointFromImage 转换下坐标：

void rasterImageViewer1_MouseDown(object sender, MouseEventArgs e)
{
point = new Point(e.X, e.Y);
RasterImage image = this.rasterImageViewer1.Image;
LeadPoint ImagePoint = new LeadPoint(e.X, e.Y);
ImagePoint = image.PointFromImage(RasterViewPerspective.LeftTop, ImagePoint);
RasterColor rc = this.rasterImageViewer1.Image.GetPixelColor(ImagePoint.X, ImagePoint.Y);
}

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leadcom · leadcom

解决了，但你提供的代码还有一个小问题。
需要先将取得的坐标转换一下，因为图片显示的比例不一样。

point = new Point(e.X, e.Y);
Transformer t = new Transformer(DigImageUtils.ToMatrix(ImageViewer.ImageTransform));
point = Point.Round(t.PointToLogical(point));
ImagePoint = new LeadPoint(point.X, point.Y);
ImagePoint = ImageViewer.Image.PointFromImage(RasterViewPerspective.LeftTop, ImagePoint);
rasterColor = ImageViewer.Image.GetPixelColor(ImagePoint.X, ImagePoint.Y);

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iceman · iceman

回复 7楼leadcom的帖子

好的，感谢您的补充，谢谢

为了给你提供更优质的服务，请对本次服务进行评分。我们会认真对待你提出的宝贵意见，谢谢

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[已处理] 取图片中某一个地方颜色问题