[英]Resize Image Keep Aspect Ratio White Line Border
我使用以下代码(从此处的示例2进行改编)来调整图像的大小,以保持宽高比。但是我在调整大小后的图像周围始终出现白色边框。我在做什么错。
Bitmap ResizekeepAspectRatio(Bitmap imgPhoto, int Width, int Height)
{
int sourceWidth = imgPhoto.Width;
int sourceHeight = imgPhoto.Height;
int sourceX = 0;
int sourceY = 0;
int destX = 0;
int destY = 0;
float nPercent = 0;
float nPercentW = 0;
float nPercentH = 0;
nPercentW = ((float)Width / (float)sourceWidth);
nPercentH = ((float)Height / (float)sourceHeight);
if (nPercentH < nPercentW)
{
nPercent = nPercentH;
destX = System.Convert.ToInt16((Width -
(sourceWidth * nPercent)) / 2);
}
else
{
nPercent = nPercentW;
destY = System.Convert.ToInt16((Height -
(sourceHeight * nPercent)) / 2);
}
int destWidth = (int)(sourceWidth * nPercent);
int destHeight = (int)(sourceHeight * nPercent);
Bitmap bmPhoto = new Bitmap(Width, Height,
PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(imgPhoto.HorizontalResolution,
imgPhoto.VerticalResolution);
Graphics grPhoto = Graphics.FromImage(bmPhoto);
grPhoto.Clear(Color.White);
grPhoto.InterpolationMode =
InterpolationMode.HighQualityBicubic;
grPhoto.DrawImage(imgPhoto,
new Rectangle(destX, destY, destWidth, destHeight),
new Rectangle(sourceX, sourceY, sourceWidth, sourceHeight),
GraphicsUnit.Pixel);
grPhoto.Dispose();
return bmPhoto;
}
更新:
样本大小调整后的图像
放大角落显示白色边框
尝试换线
Bitmap bmPhoto = new Bitmap(Width, Height,
PixelFormat.Format24bppRgb);
To
Bitmap bmPhoto = new Bitmap(destWidth, destHeight,
PixelFormat.Format24bppRgb);
由于您大多数时候都想保持宽高比,因此最终会在图像周围留有额外的空间,因此,如果您不需要这些额外的空间,请使新图片的尺寸适合新的目标尺寸
编辑:
Try to comment out the line grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic
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