Question

我正在使用WinForms。我的应用程序像一个简单的图像查看器。它打开图像文件转到下一页，放大并缩小。我的应用程序的问题是，当我重新调整大小或放大图像时，图像开始变得模糊。当我缩小或放大时，如何防止图像模糊？

当我在Windows Photo Viewer上查看并重新调整相同图像大小时，图像清晰。当我在我的应用程序中打开图像时，图像是清晰的，但是一旦我开始重新调整大小，例如当我开始使用缩放时，它开始变得模糊。

我尝试在缩小方法中实现此代码，但我无法弄清楚如何执行此操作。

    FileStream _stream;
    Image _myImg; // setting the selected tiff
    string _fileName;
    private int intCurrPage = 0; // defining the current page

    private void Open_Btn_Click(object sender, EventArgs e)
    {
        if (openFileDialog1.ShowDialog() == DialogResult.OK)
        {
            lblFile.Text = openFileDialog1.FileName; //Shows the filename in the lable
            Open_Image_Control();

            Image img = Image.FromFile(openFileDialog1.FileName);
            pictureBox1.Image = img;
            pictureBox1.Width = img.Width;
            pictureBox1.Height = img.Height;
            this.pictureBox1.Image.RotateFlip(RotateFlipType.Rotate90FlipNone); // Rotates image 90 degrees

        }
    }

    public void Open_Image_Control()
    {
        Image myBmp;

        if (_myImg == null)
        {
            _fileName = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N"));
            File.Copy(@lblFile.Text, _fileName);
            _stream = new FileStream(_fileName, FileMode.Open, FileAccess.Read);
            _myImg = Image.FromStream(_stream);
        }

        int intPages = _myImg.GetFrameCount(System.Drawing.Imaging.FrameDimension.Page); // getting the number of pages of this tiff
        intPages--; // the first page is 0 so we must correct the number of pages to -1
        lblNumPages.Text = Convert.ToString(intPages); // showing the number of pages
        lblCurrPage.Text = Convert.ToString(intCurrPage); // showing the number of page on which we're on

        _myImg.SelectActiveFrame(System.Drawing.Imaging.FrameDimension.Page, intCurrPage); // going to the selected page

        myBmp = new Bitmap(_myImg, pictureBox1.Width, pictureBox1.Height);

        pictureBox1.Image = myBmp; // showing the page in the pictureBox1 
    }

    private void ZoomIN_Btn_Click(object sender, EventArgs e)
    {
        this.pictureBox1.Width += 175; //Zoom width by 75
        this.pictureBox1.Height += 175; //Zoom height by 75
    }

    private void ZoomOut_Btn_Click(object sender, EventArgs e)
    {
        this.pictureBox1.Width -= 175; //Zoom out width by 75
        this.pictureBox1.Height -= 175; //Zoom out height by 75
    }

    private void NextPage_btn_Click(object sender, EventArgs e)
    {
        if (intCurrPage == Convert.ToInt32(lblNumPages.Text)) // if you have reached the last page it ends here
                                                              // the "-1" should be there for normalizing the number of pages
        { intCurrPage = Convert.ToInt32(lblNumPages.Text); }
        else
        {

            intCurrPage++; //page increment (Goes to next page)
            Open_Image_Control();
            this.pictureBox1.Image.RotateFlip(RotateFlipType.Rotate90FlipNone); // Rotates image 90 degrees
        }
    }

我看的图像尺寸：

尺寸：2540 x 3289

尺寸：2533 x 3284

尺寸：2538 x 3282

尺寸：2479 x 3508

{{1}}

缩放/调整图像模糊

0 个答案: