Last time I shared C# code which can resize an image with desired size
by keeping same Height vs. Width ratio. Now I am going to share next step of
image processing code, which can compress an image without (almost) losing it
quality.
Usually an image which you may have taken from one 10 Mega pixel digital
camera generates image around 5MB file size. To store same size in webserver
and showing it in user’s desktop will slowdown users website browsing
experience. For that reason now all website especially photo sharing and social
network websites, like facebook.com or google plus etc. compress these images
in smaller file size without losing image quality and store in webserver. This
technique saves webserver storage and saves network bandwidth when user opens
these.
Here I am sharing one method which has written in C# and VB.Net code
(base code found somewhere in google then I updated as I need). This method can
invoke by just one single line of code and can get compressed image.
How can I use this code in my application?
To use/invoke this method:
CompressJPEGImage(Bitmap Image, Image Name With Full Path)
To use this method you need to create an object of the class where you
will define this method and then need call it with parameters ‘image object’
and ‘image full name with path’ where compressed will be saved. On successful
compression this method will return 'true' else 'false'.
In my application I have written two overload methods to save the
compress image and sometimes to get compressed image object as a return of the
method as based on my requirement.
Full code in C#.Net as below:
public bool CompressJPEGImage(Bitmap bmp1, string tempImgNameWithPath)
{
ImageCodecInfo jgpEncoder = GetEncoder(ImageFormat.Jpeg);
// for the
Quality parameter category.
System.Drawing.Imaging.Encoder myEncoder =
System.Drawing.Imaging.Encoder.Quality;
EncoderParameters
myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, 75L);
myEncoderParameters.Param[0] = myEncoderParameter;
try
{
bmp1.Save(tempImgNameWithPath, jgpEncoder, myEncoderParameters);
return true;
}
catch
(Exception)
{
return false;
}
}
Full code in VB.Net as below:
Public Function CompressJPEGImage(bmp1 As Bitmap, tempImgNameWithPath As String) As Boolean
Dim jgpEncoder As ImageCodecInfo = GetEncoder(ImageFormat.Jpeg)
' for the Quality parameter category.
Dim myEncoder As System.Drawing.Imaging.Encoder = System.Drawing.Imaging.Encoder.Quality
Dim myEncoderParameters As New EncoderParameters(1)
Dim myEncoderParameter As New EncoderParameter(myEncoder, 75L)
myEncoderParameters.Param(0) = myEncoderParameter
Try
bmp1.Save(tempImgNameWithPath, jgpEncoder, myEncoderParameters)
Return True
Catch generatedExceptionName As Exception
Return False
End Try
End Function
How can I change image quality and generated size based on my
requirement?
For my application I have compressed 75% (75L) but you can change it as
per your requirement. If you increase this value then file size and image
quality both will increase. Run this code with different parameter value and
get image as per your requirement.
Thanks for reading my blog I hope this code will help you to write code.
