Below class have 5 methods
ResizeFromByteArray, ResizeFromStream, AddWaterMark, AddWaterMarkWithQualitySetting and ImageCodecInfo.
Method names pretty self explanatory and i use it quite a lot to re-size image files on the flay or add watermark to uploads.
Here is the class ImageResizer.cs
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
public class ImageResize
{
public static byte[] ResizeFromByteArray(int MaxSideSize, Byte[] byteArrayIn, string fileName)
{
byte[] byteArray = null; // really make this an error gif
MemoryStream ms = new MemoryStream(byteArrayIn);
byteArray = ImageResize.ResizeFromStream(MaxSideSize, ms, fileName);
return byteArray;
}
public static byte[] ResizeFromStream(int MaxSideSize, Stream Buffer, string fileName)
{
byte[] byteArray = null; // really make this an error gif
try
{
Bitmap bitMap = new Bitmap(Buffer);
int intOldWidth = bitMap.Width;
int intOldHeight = bitMap.Height;
int intNewWidth;
int intNewHeight;
int intMaxSide;
if (intOldWidth >= intOldHeight)
{
intMaxSide = intOldWidth;
}
else
{
intMaxSide = intOldHeight;
}
if (intMaxSide > MaxSideSize)
{
//set new width and height
double dblCoef = MaxSideSize / (double)intMaxSide;
intNewWidth = Convert.ToInt32(dblCoef * intOldWidth);
intNewHeight = Convert.ToInt32(dblCoef * intOldHeight);
}
else
{
intNewWidth = intOldWidth;
intNewHeight = intOldHeight;
}
Size ThumbNailSize = new Size(intNewWidth, intNewHeight);
System.Drawing.Image oImg = System.Drawing.Image.FromStream(Buffer);
System.Drawing.Image oThumbNail = new Bitmap(ThumbNailSize.Width, ThumbNailSize.Height);
Graphics oGraphic = Graphics.FromImage(oThumbNail);
oGraphic.CompositingQuality = CompositingQuality.HighQuality;
oGraphic.SmoothingMode = SmoothingMode.HighQuality;
oGraphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
Rectangle oRectangle = new Rectangle
(0, 0, ThumbNailSize.Width, ThumbNailSize.Height);
oGraphic.DrawImage(oImg, oRectangle);
MemoryStream ms = new MemoryStream();
oThumbNail.Save(ms, ImageFormat.Jpeg);
byteArray = new byte[ms.Length];
ms.Position = 0;
ms.Read(byteArray, 0, Convert.ToInt32(ms.Length));
oGraphic.Dispose();
oImg.Dispose();
ms.Close();
ms.Dispose();
}
catch (Exception)
{
int newSize = MaxSideSize - 20;
Bitmap bitMap = new Bitmap(newSize, newSize);
Graphics g = Graphics.FromImage(bitMap);
g.FillRectangle(new SolidBrush(Color.Gray), new Rectangle(0, 0, newSize, newSize));
Font font = new Font("Courier", 8);
SolidBrush solidBrush = new SolidBrush(Color.Red);
g.DrawString("Failed File", font, solidBrush, 10, 5);
g.DrawString(fileName, font, solidBrush, 10, 50);
MemoryStream ms = new MemoryStream();
bitMap.Save(ms, ImageFormat.Jpeg);
byteArray = new byte[ms.Length];
ms.Position = 0;
ms.Read(byteArray, 0, Convert.ToInt32(ms.Length));
ms.Close();
ms.Dispose();
bitMap.Dispose();
solidBrush.Dispose();
g.Dispose();
font.Dispose();
}
return byteArray;
}
public static byte[] AddWaterMark(Byte[] byteArrayIn, string watermarkText, Brush brushcolor)
{
byte[] byteArray = null;
MemoryStream ms = new MemoryStream(byteArrayIn);
Image img = System.Drawing.Image.FromStream(ms);
ImageCodecInfo jgpEncoder = GetEncoder(ImageFormat.Jpeg);
Encoder myEncoder =Encoder.Quality;
EncoderParameters myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, 75L);
myEncoderParameters.Param[0] = myEncoderParameter;
Graphics gr = Graphics.FromImage(img);
gr.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
gr.DrawString(watermarkText, new Font("Tahoma", 10), brushcolor, new Point(0, 0));
MemoryStream output = new MemoryStream();
img.Save(output, jgpEncoder, myEncoderParameters);
byteArray = new byte[output.Length];
output.Position = 0;
output.Read(byteArray, 0, Convert.ToInt32(output.Length));
return byteArray;
}
public static byte[] AddWaterMarkWithQualitySetting(Byte[] byteArrayIn, string watermarkText, Brush brushcolor)
{
byte[] byteArray = null;
MemoryStream ms = new MemoryStream(byteArrayIn);
Image img = System.Drawing.Image.FromStream(ms);
ImageCodecInfo jgpEncoder = GetEncoder(ImageFormat.Jpeg);
Encoder myEncoder = Encoder.Quality;
EncoderParameters myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, 75L); //%75
myEncoderParameters.Param[0] = myEncoderParameter;
Graphics gr = Graphics.FromImage(img);
gr.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
gr.DrawString(watermarkText, new Font("Tahoma", 10), brushcolor, new Point(0, 0));
MemoryStream output = new MemoryStream();
img.Save(output, jgpEncoder, myEncoderParameters);
byteArray = new byte[output.Length];
output.Position = 0;
output.Read(byteArray, 0, Convert.ToInt32(output.Length));
return byteArray;
}
private static ImageCodecInfo GetEncoder(ImageFormat format)
{
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();
foreach (ImageCodecInfo codec in codecs)
{
if (codec.FormatID == format.Guid)
{
return codec;
}
}
return null;
}
}
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