今天我在尝试调整图像大小并裁剪时遇到了类似的问题,我使用了以下代码来调整图像大小。
private static Image resizeImage(Image imgToResize, Size size)
{
int sourceWidth = imgToResize.Width;
int sourceHeight = imgToResize.Height;
float nPercent = 0;
float nPercentW = 0;
float nPercentH = 0;
nPercentW = ((float)size.Width / (float)sourceWidth);
nPercentH = ((float)size.Height / (float)sourceHeight);
if (nPercentH < nPercentW)
nPercent = nPercentH;
else
nPercent = nPercentW;
int destWidth = (int)(sourceWidth * nPercent);
int destHeight = (int)(sourceHeight * nPercent);
Bitmap b = new Bitmap(destWidth, destHeight);
Graphics g = Graphics.FromImage((Image)b);
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
g.Dispose();
return (Image)b;
}
然后这段代码用于裁剪...
private static Image cropImage(Image img, Rectangle cropArea)
{
Bitmap bmpImage = new Bitmap(img);
Bitmap bmpCrop = bmpImage.Clone(cropArea,
bmpImage.PixelFormat);
return (Image)(bmpCrop);
}
那么这就是我如何调用上面的代码...
Image img = Image.FromFile(@"C:\Users\****\Pictures\image.jpg");
img = ImageHandler.ResizeImage(img, new Size(400, 300));
img = ImageHandler.CropImage(img, new Rectangle(0, 25, 400, 250));
long quality = 90;
在裁剪部分我一直收到错误,但是调整大小的部分运行正常!
原来,在调整大小的过程中发生了错误并传递到裁剪函数。计算时,实际图像尺寸变成了399而不是我传入的400。
所以,当我将400作为裁剪参数传入时,它试图裁剪一个399像素宽度的图像,而这个图像的宽度应该是400像素,结果导致内存溢出错误!
以上大部分代码来源于http://www.switchonthecode.com/tutorials/csharp-tutorial-image-editing-saving-cropping-and-resizing