Question

Calling all experts - Image Resizing problem!

Asked by: here4u247

Hello Guys,

I've this problem where i have to create two images (thumbnail and mid sized image) for a high res (1280x1020) images.

I can generate the thumbnails fine no problem at all, but the problem comes when i try to resize it to a middle sized image (i.e. 500x400) the image size is always bigger than the original image size which it shouldn't be because its not a high res image (ie the width&heights are less)....

i tried to change CompositingQuality & InterpolationMode  etc but to no success.

I don't what i'm doing wrong??? here is my code:
private Bitmap m_resized;
Bitmap input= new Bitmap(@"C:\highRes.jpg");

            //Resize the image
            m_resized = new Bitmap(resizedWidth, resizedHeight);
            m_graphic = Graphics.FromImage(m_resized);
            m_graphic.CompositingQuality = CompositingQuality.HighQuality;
            m_graphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
            m_graphic.DrawImage(input, new Rectangle(0, 0, m_resized.Width, m_resized.Height), 0, 0, input.Width, input.Height, GraphicsUnit.Pixel);
            //Clean up
            m_graphic.Dispose();

m_resized.Save(@"C:\highRes_midsized.jpg");


Thanks in advance

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Asked On
2007-08-22 at 08:31:36ID22779726
Tags

image

,

resize

Topics

Programming for ASP.NET

,

C# Programming Language

,

Microsoft Visual Basic.Net

Participating Experts
5
Points
500
Comments
12

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Answers

 

by: drekowPosted on 2007-08-22 at 08:51:35ID: 19747259

on this line take out the new rectangle command.  the drawimage will support (original pic,x,y,width,height) and that will do it for you.

m_graphic.DrawImage(input, new Rectangle(0, 0, m_resized.Width, m_resized.Height), 0, 0, input.Width, input.Height, GraphicsUnit.Pixel);

would be something like this

m_graphic.DrawImage(input,0,0,input.width,input.height)

Dale

 

by: drekowPosted on 2007-08-22 at 08:52:56ID: 19747274

sorry. it should look like this

m_graphic.DrawImage(input,0,0,new width, new height)

Dale

 

by: here4u247Posted on 2007-08-22 at 09:32:38ID: 19747672

i've tried it, but to no avail, its produces the same file sizes...

 

by: drekowPosted on 2007-08-22 at 09:57:48ID: 19747834

I am going to lunch right now but when I get back I will post my code for you so you can see how I did this.

Dale

 

by: here4u247Posted on 2007-08-22 at 10:10:34ID: 19747909

cool dude, i really appreciates ur help

 

by: FernandoSotoPosted on 2007-08-22 at 10:30:13ID: 19748068

Hi here4u247;

This call will return a string in the format vx.x.xx of the runtime environment.

string rtversion = System.Runtime.InteropServices.RuntimeEnvironment.GetSystemVersion;

Fernando

 

by: FernandoSotoPosted on 2007-08-22 at 10:34:21ID: 19748101

Disregard my last post. Posted to wrong page. Sorry.

 

by: photowhizPosted on 2007-08-22 at 11:38:52ID: 19748616

When you say "image size" do you mean the horizontal height and width in pixels or do you mean the number of bytes in the file? Your midsize image is a JPEG created with CompositingQuality.HighQuality, it could very well have more bytes than a low-quality file with a greater number of pixels.

If you mean the number of pixels is more, try:

    m_graphic.DrawImage(input, 0, 0, resizedWidth, resizedHeight)

 

by: drekowPosted on 2007-08-22 at 12:13:36ID: 19748915

I took your code and put it to in an application. Here is the code as I used it

private Bitmap m_resized;
Bitmap input= new Bitmap(@"C:\Somefile.jpg");
                  int resizedWidth = 100; //Giving a static value for the example
                  int resizedHeight = 100; //Giving a static value for the example
                  Graphics m_graphic; //I am sure you have it declared elsewhere.
                  //Resize the image
                  m_resized = new Bitmap(resizedWidth, resizedHeight);
                  m_graphic = Graphics.FromImage(m_resized);
                  //m_graphic.CompositingQuality = CompositingQuality.HighQuality;
                  //m_graphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
                  m_graphic.DrawImage(input, 0, 0, resizedWidth, resizedHeight); //Removed the new rectangle and used the new picture size
                  //Clean up
                  m_graphic.Dispose();
                  
                  m_resized.Save(@"C:\somefile_midsized.jpg",System.Drawing.Imaging.ImageFormat.Jpeg);
//Using the imageformat.jpeg

The original picture was 9.18 KB and after changing to the new size the file size was 2.61 KB

I hope this helps

Dale

 

by: Snarf0001Posted on 2007-08-22 at 14:50:39ID: 19749946

drekow's last solution shoudl work fine, but the problem was the save.  You had:
  m_resized.Save(@"C:\highRes_midsized.jpg");

while he entered
  m_resized.Save(@"C:\somefile_midsized.jpg",System.Drawing.Imaging.ImageFormat.Jpeg);

If you don't actually specify the ImageFormat to save in, it will default to a PNG, which will be much larger than a jpg.

 

by: SystemExpertPosted on 2007-08-22 at 21:59:40ID: 19751669

Hi,
Have you ever thought of streaming thumbnails just by passing query string indicating width or height of thumbnail you need, and most importantly passing those to image itself?

<img src=MyImage.jpg?Height=200>

http://www.c-sharpcorner.com/UploadFile/desaijm/HTTPHandlersForImages11152005062705AM/HTTPHandlersForImages.aspx

Thanks

 

by: here4u247Posted on 2007-08-23 at 08:32:55ID: 19755270

thanks guys, i forgot to specify the image format, so as Snarf0001 mention it was saving as png eventhough the file extension was jpg, that made the file size considerably larger....d'oh!

thanks again....

20120131-EE-VQP-002

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