[英]Saving Image From Picturebox
Iam將圖像繪制到圖片框。 我根據寬度和高度在圖片框中調整圖像大小,以使其正確地適合picutrebox。 之后,我想保存它,同時保存它,我也想將非圖像繪制部分也保存在保存的文件中。 請查看屏幕截圖,在屏幕截圖中,我有2個白色部分標記為“ X”。 當我將圖像保存在圖片框中時,我也想將空白部分(紅色標記)也保存為透明.png或純白色.jpg。
實際上,我從Google復制了部分代碼並進行了修改。 如果有人請逐行解釋它,那將是非常不錯的幫助。
這就是我到目前為止所不知道的
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog open = new OpenFileDialog();
open.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp; *.png)|*.jpg; *.jpeg; *.gif; *.bmp; *.png";
if (open.ShowDialog() == DialogResult.OK)
{
Image original = Bitmap.FromFile(open.FileName);
pictureBox1.Image = new Bitmap(ScaleImage(original));
pictureBox1.Padding = new Padding((pictureBox1.Width - ScaleImage(original).Width) / 2, (pictureBox1.Height - ScaleImage(original).Height) / 2, 0, 0);
}
}
private Bitmap ScaleImage(Image oldImage)
{
double resizeFactor = 1;
if (oldImage.Width > 300 || oldImage.Height > 300)
{
double widthFactor = Convert.ToDouble(oldImage.Width) / 300;
double heightFactor = Convert.ToDouble(oldImage.Height) / 125;
resizeFactor = Math.Max(widthFactor, heightFactor);
}
int width = Convert.ToInt32(oldImage.Width / resizeFactor);
int height = Convert.ToInt32(oldImage.Height / resizeFactor);
Bitmap newImage = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
newImage.MakeTransparent(Color.White);
Graphics g = Graphics.FromImage(newImage);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.DrawImage(oldImage, 0, 0, newImage.Width, newImage.Height);
return newImage;
}
private void button2_Click(object sender, EventArgs e)
{
pictureBox1.BackColor = Color.White;
pictureBox1.Image.Save("D:\\temp.png", ImageFormat.Png);
}
我希望這會有所幫助。 嘗試使用它來保存調整大小后的圖像(我猜是在button2_Click
)。
using (Bitmap bitmap = new Bitmap(pictureBox1.Width, pictureBox1.Height))
{
using (Graphics graphics = Graphics.FromImage(bitmap))
{
graphics.Clear(Color.Transparent);
graphics.DrawImage(pictureBox1.Image, (bitmap.Width - pictureBox1.Image.Width) / 2, (bitmap.Height - pictureBox1.Image.Height) / 2);
}
bitmap.Save(@"D:\tmpMod.png", ImageFormat.Png);
}
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