Solved

resize image

Posted on 2011-09-23
19
314 Views
Last Modified: 2012-05-12
http://www.telerik.com/community/forums/aspnet/upload/how-to-resize-image.aspx

I have this link but on that I can't keep same aspect ratio same. What I need to do?
0
Comment
Question by:1jaws
19 Comments
 
LVL 26

Accepted Solution

by:
Shaun Kline earned 250 total points
ID: 36588865
To keep the aspect ratio, you would need to calculate the change on one of the dimensions and apply that change to the other dimension. I.e. divide the new width for the image by the original width of the image. Then multiply this value to the original height of the image.
0
 

Author Comment

by:1jaws
ID: 36588886
thank you for replying.. is it possible to show that how I might be able to do that?
0
 
LVL 8

Assisted Solution

by:PeteEngineer
PeteEngineer earned 125 total points
ID: 36588890

public static Size ProportionalSize(Size imageSize, Size MaxW_MaxH)
            {
                double multBy= 1.01;
                double w= imageSize.Width;   double h= imageSize.Height;

                while(w < MaxW_MaxH.Width && h < MaxW_MaxH.Height)
                {
                    w= imageSize.Width*multBy;
                    h= imageSize.Height*multBy;
                    multBy= multBy+.001;
                }

                while(w > MaxW_MaxH.Width || h > MaxW_MaxH.Height)
                {
                    multBy= multBy-.001;
                    w= imageSize.Width*multBy;
                    h= imageSize.Height*multBy;
                }

                if(imageSize.Width < 1)
                    imageSize=new Size(imageSize.Width+-imageSize.Width+1, imageSize.Height-imageSize.Width-1);
                if(imageSize.Height < 1)
                    imageSize=new Size(imageSize.Width-imageSize.Height-1, imageSize.Height+-imageSize.Height+1);

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

Open in new window

0
MIM Survival Guide for Service Desk Managers

Major incidents can send mastered service desk processes into disorder. Systems and tools produce the data needed to resolve these incidents, but your challenge is getting that information to the right people fast. Check out the Survival Guide and begin bringing order to chaos.

 

Author Comment

by:1jaws
ID: 36588917
I have this code and how I need to put above code to this?
public bool ThumbnailCallback()  
{  
    return false;  
}  
 
//Create a thumbnail  
public void CreateThumb(string fileName, System.IO.Stream imageStream, int width, int height)  
{  
    System.Drawing.Image.GetThumbnailImageAbort thumbnailImageAbortDelegate = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);  
    using (Bitmap originalImage = new Bitmap(imageStream))  
    {  
        using (System.Drawing.Image thumbnail = originalImage.GetThumbnailImage(width, height, thumbnailImageAbortDelegate, IntPtr.Zero))  
        {  
            thumbnail.Save(fileName);  
        }  
    }  
}  
 
 
private void Button1_Click(object sender, System.EventArgs e)  
{  
    Telerik.WebControls.UploadedFile file = RadUpload1.UploadedFiles[0];  
    string targetFolder = "c:\\temp\\";  
    string suffix = "_thumb";  
    CreateThumb(  
            targetFolder +   
            string.Concat(file.GetNameWithoutExtension(), suffix, file.GetExtension()), file.InputStream,  
            300,   300);  
}

Open in new window

0
 
LVL 26

Expert Comment

by:Shaun Kline
ID: 36588922
Using the code from the example...

Note: you could use either the passed in width or height parameter to determine the aspect ratio.
public void CreateThumb(string fileName, System.IO.Stream imageStream, int width, int height)  
{  
    System.Drawing.Image.GetThumbnailImageAbort thumbnailImageAbortDelegate = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);  
    using (Bitmap originalImage = new Bitmap(imageStream))  
    {  
        int newHeight = originalImage.Height * (newWidth / originalImage.Width);
        using (System.Drawing.Image thumbnail = originalImage.GetThumbnailImage(width, newHeight, thumbnailImageAbortDelegate, IntPtr.Zero))  
        {  
            thumbnail.Save(fileName);  
        }  
    }  
}

Open in new window

0
 

Author Comment

by:1jaws
ID: 36588939
says newWidth doest exist in the context
0
 

Author Comment

by:1jaws
ID: 36588968
int newWidth = originalImage.Width;
0
 

Author Comment

by:1jaws
ID: 36588993
I put above didnt work...
0
 

Author Comment

by:1jaws
ID: 36589072
Shaun_Kline, I cant get this to work, we are in right direction but actually don't know how to make this code work for me...that my size of photos automatically will size to 300x300 without changing the aspect radio...Can you be able to paste the working code, if possible?
0
 
LVL 26

Expert Comment

by:Shaun Kline
ID: 36589171
Instead of newWidth, use the passed in parameter: width.
0
 

Author Comment

by:1jaws
ID: 36589212
what do you mean? use like that? instead of width.. I am totally confused here

int newHeight = originalImage.Height * (width / originalImage.Width);
0
 

Author Comment

by:1jaws
ID: 36589231
or like this?

int newHeight = originalImage.Height * (300 / originalImage.Width);
0
 

Author Comment

by:1jaws
ID: 36589583
that is not working..
0
 

Author Comment

by:1jaws
ID: 36589609
PeteEngineer, couldnt even get your code working either.. it complians about Size, saying are you missing  references...
0
 
LVL 13

Assisted Solution

by:jonnidip
jonnidip earned 125 total points
ID: 36589879
Try this method:
void ResizeImage(String InputFileName, Int32 MaxWidth, Int32 MaxHeight, String ThumbnailFileName)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                Int32 NewWidth = 300;
                Int32 NewHeight = -1;

                #region Resize
                using (System.Drawing.Image FullsizeImage = System.Drawing.Image.FromFile(InputFileName))
                {
                    if (FullsizeImage.Width <= NewWidth)
                        NewWidth = FullsizeImage.Width;

                    NewHeight = FullsizeImage.Height * NewWidth / FullsizeImage.Width;
                    if (NewHeight > MaxHeight)
                    {
                        // Resize with height instead
                        NewWidth = FullsizeImage.Width * MaxHeight / FullsizeImage.Height;
                        NewHeight = MaxHeight;
                    }

                    // Save resized picture
                    using (System.Drawing.Image NewImage = FullsizeImage.GetThumbnailImage(NewWidth, NewHeight, null, IntPtr.Zero))
                        NewImage.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                }
                #endregion

                ms.Position = 0;

                #region Write thumbnail file
                if (!Directory.Exists(Path.GetDirectoryName(ThumbnailFileName)))
                    Directory.CreateDirectory(Path.GetDirectoryName(ThumbnailFileName));
                FileInfo fi = new FileInfo(ThumbnailFileName);
                File.WriteAllBytes(ThumbnailFileName, ms.GetBuffer());
                #endregion
            }
        }

Open in new window


Regards.
0
 

Author Comment

by:1jaws
ID: 36589915
thank you for replying, but I am really getting this figure it out based on that code I posted... if this is possible can you paste the working code, cause I am not succesfull on getting it working yet...
0
 
LVL 26

Assisted Solution

by:Shaun Kline
Shaun Kline earned 250 total points
ID: 36590042
This is the code using the width parameter that is passed into the function.
If this does not work and errors out, provide the error message. If the image does not display correctly, provide a screen capture and explain why it isn't working (i.e. how is the image distorted).
public void CreateThumb(string fileName, System.IO.Stream imageStream, int width, int height)  
{  
    System.Drawing.Image.GetThumbnailImageAbort thumbnailImageAbortDelegate = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);  
    using (Bitmap originalImage = new Bitmap(imageStream))  
    {  
        int newHeight = originalImage.Height * (width / originalImage.Width);
        using (System.Drawing.Image thumbnail = originalImage.GetThumbnailImage(width, newHeight, thumbnailImageAbortDelegate, IntPtr.Zero))  
        {  
            thumbnail.Save(fileName);  
        }  
    }  
}

Open in new window

0
 

Author Comment

by:1jaws
ID: 36590114
 using (System.Drawing.Image thumbnail = originalImage.GetThumbnailImage(width, newHeight, thumbnailImageAbortDelegate, IntPtr.Zero))

this line gives error saying Out of Memory..

when I debugged I see new height = 0
0
 

Author Comment

by:1jaws
ID: 36590190
I no longer need this questions answer... Thanks for all the efforts to all!!
0

Featured Post

How Do You Stack Up Against Your Peers?

With today’s modern enterprise so dependent on digital infrastructures, the impact of major incidents has increased dramatically. Grab the report now to gain insight into how your organization ranks against your peers and learn best-in-class strategies to resolve incidents.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
edit .asp files 5 32
Generate Unique ID in VB.NET 21 69
MYSQL responding very slow 3 28
linq .concat equivalent with expression syntax 4 8
A long time ago (May 2011), I have written an article showing you how to create a DLL using Visual Studio 2005 to be hosted in SQL Server 2005. That was valid at that time and it is still valid if you are still using these versions. You can still re…
Calculating holidays and working days is a function that is often needed yet it is not one found within the Framework. This article presents one approach to building a working-day calculator for use in .NET.
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…

820 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question