我正在使用StretchImage,因为该框可以使用分割器调整大小。看起来默认是某种平滑的双线性滤波,导致我的图像模糊并具有莫尔条纹。
答案 0 :(得分:31)
我也需要这个功能。我创建了一个继承PictureBox的类,覆盖OnPaint
并添加一个属性以允许设置插值模式:
using System.Drawing.Drawing2D;
using System.Windows.Forms;
/// <summary>
/// Inherits from PictureBox; adds Interpolation Mode Setting
/// </summary>
public class PictureBoxWithInterpolationMode : PictureBox
{
public InterpolationMode InterpolationMode { get; set; }
protected override void OnPaint(PaintEventArgs paintEventArgs)
{
paintEventArgs.Graphics.InterpolationMode = InterpolationMode;
base.OnPaint(paintEventArgs);
}
}
答案 1 :(得分:5)
我怀疑你将不得不通过Image类和DrawImage函数手动调整大小并响应PictureBox上的resize事件。
答案 2 :(得分:3)
我做了一个MSDN搜索,结果发现有一篇关于此的文章,这篇文章不是很详细,但概述了你应该使用paint事件。
http://msdn.microsoft.com/en-us/library/k0fsyd4e.aspx
我编辑了一个常用的图像缩放示例来使用此功能,请参阅下面的
编辑自:http://www.dotnetcurry.com/ShowArticle.aspx?ID=196&AspxAutoDetectCookieSupport=1
希望这有帮助
private void Form1_Load(object sender, EventArgs e)
{
// set image location
imgOriginal = new Bitmap(Image.FromFile(@"C:\images\TestImage.bmp"));
picBox.Image = imgOriginal;
// set Picture Box Attributes
picBox.SizeMode = PictureBoxSizeMode.StretchImage;
// set Slider Attributes
zoomSlider.Minimum = 1;
zoomSlider.Maximum = 5;
zoomSlider.SmallChange = 1;
zoomSlider.LargeChange = 1;
zoomSlider.UseWaitCursor = false;
SetPictureBoxSize();
// reduce flickering
this.DoubleBuffered = true;
}
// picturebox size changed triggers paint event
private void SetPictureBoxSize()
{
Size s = new Size(Convert.ToInt32(imgOriginal.Width * zoomSlider.Value), Convert.ToInt32(imgOriginal.Height * zoomSlider.Value));
picBox.Size = s;
}
// looks for user trackbar changes
private void trackBar1_Scroll(object sender, EventArgs e)
{
if (zoomSlider.Value > 0)
{
SetPictureBoxSize();
}
}
// redraws image using nearest neighbour resampling
private void picBox_Paint_1(object sender, PaintEventArgs e)
{
e.Graphics.InterpolationMode = InterpolationMode.NearestNeighbor;
e.Graphics.DrawImage(
imgOriginal,
new Rectangle(0, 0, picBox.Width, picBox.Height),
// destination rectangle
0,
0, // upper-left corner of source rectangle
imgOriginal.Width, // width of source rectangle
imgOriginal.Height, // height of source rectangle
GraphicsUnit.Pixel);
}
答案 3 :(得分:0)
在.net中调整图像大小时,System.Drawing.Drawing2D.InterpolationMode提供以下调整大小方法: