C# 处理图片问题 缩小 旋转

[zjlahbf]

试过 各种方法 缩小后 图片质量 总是有损失

比如字体 会变模糊

EncoderParameters ep = new EncoderParameters();
ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100);

也没用

请教一下 如果 原质量的缩小图片

如果有旋转的代码 参考 那就更好了

[zhaoqiliang527]

<summary>
/// 获取一个图片按等比例缩小后的大小。
/// </summary>
/// <param name="maxWidth">需要缩小到的宽度</param>
/// <param name="maxHeight">需要缩小到的高度</param>
/// <param name="imageOriginalWidth">图片的原始宽度</param>
/// <param name="imageOriginalHeight">图片的原始高度</param>
/// <returns>返回图片按等比例缩小后的实际大小</returns>
public static Size GetNewSize(int maxWidth, int maxHeight, int imageOriginalWidth, int imageOriginalHeight)
{
double w = 0.0;
double h = 0.0;
double sw = Convert.ToDouble(imageOriginalWidth);
double sh = Convert.ToDouble(imageOriginalHeight);
double mw = Convert.ToDouble(maxWidth);
double mh = Convert.ToDouble(maxHeight);

if (sw < mw && sh < mh)
{
w = sw;
h = sh;
}
else if ((sw / sh) > (mw / mh))
{
w = maxWidth;
h = (w * sh) / sw;
}
else
{
h = maxHeight;
w = (h * sw) / sh;
}

return new Size(Convert.ToInt32(w), Convert.ToInt32(h));
}

/// <summary>
/// 对给定的一个图片（Image对象）生成一个指定大小的缩略图。
/// </summary>
/// <param name="originalImage">原始图片</param>
/// <param name="thumMaxWidth">缩略图的宽度</param>
/// <param name="thumMaxHeight">缩略图的高度</param>
/// <returns>返回缩略图的Image对象</returns>
public static System.Drawing.Image GetThumbNailImage(System.Drawing.Image originalImage, int thumMaxWidth, int thumMaxHeight)
{
Size thumRealSize = Size.Empty;
System.Drawing.Image newImage = originalImage;
Graphics graphics = null;

try
{
thumRealSize = GetNewSize(thumMaxWidth, thumMaxHeight, originalImage.Width, originalImage.Height);
newImage = new Bitmap(thumRealSize.Width, thumRealSize.Height);
graphics = Graphics.FromImage(newImage);

graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.SmoothingMode = SmoothingMode.HighQuality;

graphics.Clear(Color.Transparent);

graphics.DrawImage(originalImage, new Rectangle(0, 0, thumRealSize.Width, thumRealSize.Height), new Rectangle(0, 0, originalImage.Width, originalImage.Height), GraphicsUnit.Pixel);
}
catch { }
finally
{
if (graphics != null)
{
graphics.Dispose();
graphics = null;
}
}

return newImage;
}
/// <summary>
/// 对给定的一个图片文件生成一个指定大小的缩略图。
/// </summary>
/// <param name="originalImage">图片的物理文件地址</param>
/// <param name="thumMaxWidth">缩略图的宽度</param>
/// <param name="thumMaxHeight">缩略图的高度</param>
/// <returns>返回缩略图的Image对象</returns>
public static System.Drawing.Image GetThumbNailImage(string imageFile, int thumMaxWidth, int thumMaxHeight)
{
System.Drawing.Image originalImage = null;
System.Drawing.Image newImage = null;

try
{
originalImage = System.Drawing.Image.FromFile(imageFile);
newImage = GetThumbNailImage(originalImage, thumMaxWidth, thumMaxHeight);
}
catch { }
finally
{
if (originalImage != null)
{
originalImage.Dispose();
originalImage = null;
}
}

return newImage;
}
/// <summary>
/// 对给定的一个图片文件生成一个指定大小的缩略图，并将缩略图保存到指定位置。
/// </summary>
/// <param name="originalImageFile">图片的物理文件地址</param>
/// <param name="thumbNailImageFile">缩略图的物理文件地址</param>
/// <param name="thumMaxWidth">缩略图的宽度</param>
/// <param name="thumMaxHeight">缩略图的高度</param>
public static void MakeThumbNail(string originalImageFile, string thumbNailImageFile, int thumMaxWidth, int thumMaxHeight)
{
System.Drawing.Image newImage = GetThumbNailImage(originalImageFile, thumMaxWidth, thumMaxHeight);
try
{
newImage.Save(thumbNailImageFile, ImageFormat.Jpeg);
}
catch
{ }
finally
{
newImage.Dispose();
newImage = null;
}
}
/// <summary>
/// 将一个图片的内存流调整为指定大小，并返回调整后的内存流。
/// </summary>
/// <param name="originalImageStream">原始图片的内存流</param>
/// <param name="newWidth">新图片的宽度</param>
/// <param name="newHeight">新图片的高度</param>
/// <returns>返回调整后的图片的内存流</returns>
public static MemoryStream ResizeImage(Stream originalImageStream, int newWidth, int newHeight)
{
MemoryStream newImageStream = null;

System.Drawing.Image newImage = Globals.GetThumbNailImage(System.Drawing.Image.FromStream(originalImageStream), newWidth, newHeight);
if (newImage != null)
{
newImageStream = new MemoryStream();
newImage.Save(newImageStream, ImageFormat.Jpeg);
}

return newImageStream;
}
/// <summary>
/// 将一个内存流保存为磁盘文件。
/// </summary>
/// <param name="stream">内存流</param>
/// <param name="newFile">目标磁盘文件地址</param>
public static void SaveStreamToFile(Stream stream, string newFile)
{
if (stream == null || stream.Length == 0 || string.IsNullOrEmpty(newFile))
{
return;
}

byte[] buffer = new byte[stream.Length];
stream.Position = 0;
stream.Read(buffer, 0, buffer.Length);
FileStream fileStream = new FileStream(newFile, FileMode.OpenOrCreate, FileAccess.Write);
fileStream.Write(buffer, 0, buffer.Length);
fileStream.Flush();
fileStream.Close();
fileStream.Dispose();
}
/// <summary>
/// 对一个指定的图片加上图片水印效果。
/// </summary>
/// <param name="imageFile">图片文件地址</param>
/// <param name="waterImage">水印图片（Image对象）</param>
public static void CreateImageWaterMark(string imageFile, System.Drawing.Image waterImage)
{
if (string.IsNullOrEmpty(imageFile) || !File.Exists(imageFile) || waterImage == null)
{
return;
}

System.Drawing.Image originalImage = System.Drawing.Image.FromFile(imageFile);

if (originalImage.Width - 10 < waterImage.Width || originalImage.Height - 10 < waterImage.Height)
{
return;
}

Graphics graphics = Graphics.FromImage(originalImage);

int x = originalImage.Width - waterImage.Width - 10;
int y = originalImage.Height - waterImage.Height - 10;
int width = waterImage.Width;
int height = waterImage.Height;

graphics.DrawImage(waterImage, new Rectangle(x, y, width, height), 0, 0, width, height, GraphicsUnit.Pixel);
graphics.Dispose();

MemoryStream stream = new MemoryStream();
originalImage.Save(stream, ImageFormat.Jpeg);
originalImage.Dispose();

System.Drawing.Image imageWithWater = System.Drawing.Image.FromStream(stream);

imageWithWater.Save(imageFile);
imageWithWater.Dispose();
}
/// <summary>
/// 对一个指定的图片加上文字水印效果。
/// </summary>
/// <param name="imageFile">图片文件地址</param>
/// <param name="waterText">水印文字内容</param>
public static void CreateTextWaterMark(string imageFile, string waterText)
{
if (string.IsNullOrEmpty(imageFile) || string.IsNullOrEmpty(waterText) || !File.Exists(imageFile))
{
return;
}

System.Drawing.Image originalImage = System.Drawing.Image.FromFile(imageFile);

Graphics graphics = Graphics.FromImage(originalImage);

graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;

SolidBrush brush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
Font waterTextFont = new Font("Arial", 16, FontStyle.Regular);
SizeF waterTextSize = graphics.MeasureString(waterText, waterTextFont);

float x = (float)originalImage.Width - waterTextSize.Width - 10F;
float y = (float)originalImage.Height - waterTextSize.Height - 10F;

graphics.DrawString(waterText, waterTextFont, brush, x, y);

graphics.Dispose();
brush.Dispose();

MemoryStream stream = new MemoryStream();
originalImage.Save(stream, ImageFormat.Jpeg);
originalImage.Dispose();

System.Drawing.Image imageWithWater = System.Drawing.Image.FromStream(stream);

imageWithWater.Save(imageFile);
imageWithWater.Dispose();
}

/// <summary>
/// 判断上传组件是否包含内容。
/// </summary>
/// <param name="fileUpload">ASP.NET 2.0标准上传组件</param>
/// <returns>如果数据有效，则返回True，否则返回False</returns>
public static bool IsAttachmentValid(FileUpload fileUpload)
{
if (fileUpload != null &&
fileUpload.PostedFile != null &&
!string.IsNullOrEmpty(fileUpload.PostedFile.FileName) &&
fileUpload.PostedFile.ContentLength > 0)
{
return true;
}
return false;
}

[_autotest]

做学问固然要紧，身体是根本，量力而行。淡定。

[cg2003]

回复内容太短了！ 今天怎么这样了？

[mjp1234airen4385]

压缩当然是有损压缩的。没有什么奇怪的。

[zjlahbf]

3 楼发的代码 经过测试 不好.. 处理过后的图片 质量 还是不好

我是和 ps 对比的... 而且有一个很严重的问题 就是 缩小后的图片 居然比原图 还大

原图 300多K 而缩小后 却有600多K.. 其他的没测试 不过给了我一个很好的思路 还是谢谢.

[zjlahbf]

4 楼那个 方法和我差不多 但是 质量过低这个问题 解决不了

[Joe-xXx]

收藏一个，对我有用--->已点击！哈哈

[zjlahbf]

来人喃...

冰天雪地裸体跪求

[wuyq11]

using (Bitmap bmp = new Bitmap(@"C:\a.bmp"))
{
Graphics g = this.CreateGraphics();
Rectangle rect = new Rectangle(0, 0, 100, 100);
bmp.RotateFlip(RotateFlipType.RotateNoneFlipX);
g.DrawImage(bmp, rect);
}
http://topic.csdn.net/u/20090420/00/4042e404-e802-45f7-8b25-c7fbc5a81c76.html