A generic error occurred in GDI+

I know how frustrating it can be debugging this problem. One case when it occurs is when you try to save an image created from a Stream e.g. using Bitmap Save function.

Few things to consider overcoming this error:

- Make sure you allow the write permission on the folder where image is being saved.

- Release resources after saving the image. For example if you create a Bitmap object from a stream dispose resource by bmp.Dispose() or similar syntax

I will suggest using a try catch finally block like this (I am using C# here):

Bitmap bmp = null; 

try

{

     bmp = new Bitmap(myPostedFile.InputStream, false);

    //save image, do things here 

}

catch

{

}

finally

{

    if (bmp != null)
    {
        bmp.Dispose();
    } 

} 

Was it Enough to Solve this Error?

In my case it wasn't able to solve the problem.

Solution 

Redirect after every the save reloading the page again as fresh. This way it will make sure all the resources being hold will be released and reloaded. Sounds stupid right? In my case it solved the problem. 

Example C# Redirect Code: Response.Redirect("MyPage.aspx",false); 

This article will help you create high quality thumbnail from an image as well as resize image dynamically.

GetThumbnailImage method of class Bitmap produces a thumbnail image from the file specified. Life is so easy with it. Not always though. Sometimes the thumbnail produced has low quality - pixelated and blurred.

Why it Happens? Why My Images are Pixelated and Blurred?

Image formats like jpeg may store the thumbnail inside the same file. If we use System.Drawing.Bitmap method GetThumbnailImage, method checks if there’s a thumbnail image stored into the file and, if the thumb is found, it returns that thumbnail version scaled to the width and height you requested. If the thumbnail version of the image is smaller then the size you requested to produce, thats when problem occurs. The thumbnails produced become pixelated as we know stretching an image to a larger once reduces the Image Quality.

Solution:

Solution is really simple. We will load the source image to a System.Drawing.Image object, scale it to the desired width and height preserving good quality and save it to a new file.

Step by Step Procedure to Create a Good Quality Thumbnail:

For this example lets assume these variables

String src="c:/myImages/a.jpg";   //absolute location of source image

String dest="c:/myImages/a_th.jpg";    //absolute location of the new image created(thumbnail)

int thumbWidth=132;    //width of the image (thumbnail) to produce

You have to use these namespaces

using System.Drawing; 

using System.Drawing.Drawing2D;

Following are the Steps along with example code:

- Get the source image to a System.Drawing.Image object
System.Drawing.Image image = System.Drawing.Image.FromFile(src); 

-  Create a System.Drawing.Bitmap with the desired width and height of the thumbnail. 
int srcWidth=image.Width;
int srcHeight=image.Height; 

//we will get the sizeratio in decimal so that we dont get exception in case width is less then height.

Decimal sizeRatio = ((Decimal)srcHeight/srcWidth);
int thumbHeight=Decimal.ToInt32(sizeRatio*thumbWidth);
Bitmap bmp = new Bitmap(thumbWidth, thumbHeight);

- Create a System.Drawing.Graphics object from the Bitmap which we will use to draw the high quality scaled image
System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp);

- Set the System.Drawing.Graphics object property SmoothingMode to HighQuality
gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

- Set the System.Drawing.Graphics object property CompositingQuality to HighQuality
gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;

- Set the System.Drawing.Graphics object property InterpolationMode to High
gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

- Draw the original image into the target Graphics object scaling to the desired width and height
System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(0, 0, thumbWidth, thumbHeight);
gr.DrawImage(image, rectDestination, 0, 0, srcWidth, srcHeight, GraphicsUnit.Pixel);

- Save to destination file
bmp.Save(dest);

- dispose / release  resources
bmp.Dispose();
image.Dispose();           

Lets help each other:

I get emails often asking for help with the code. I always love to do that. Unfortunately sometimes I get too busy. I have a full-time job, maintain two sites, and married. If you have problems with this code, please post on the comment. Anybody interested helping others may reply on the comments as well.

Resources:

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