ColdFusion & .NET: Resizing the Height of an Image

Feb

09

by Mike Fleming at 6:44 am No Comments .NET, ColdFusion

After last week's post on resizing images in ColdFusion and .NET based on width, someone contacted me and asked me about resizing the image based on height.  So below is how you accomplish that in ColdFusion and in .NET.

First in ColdFusion:

action = "resize"
height = "250"
width = ""
source = "#sourceFile#"
destination = "#resizedFile#"
overwrite = "yes"
>

The .NET function is very similar to the function we covered last week about resizing based on width.  The only difference lies in lines of code where it's computing the sizes.

static void ResizeImageByHeight(string orgName, string resizeName, int resizeHeight)
{
String src = orgName;
String dest = resizeName;
int thumbHeight = resizeHeight;

//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;

Decimal sizeRatio = ((Decimal)srcWidth / srcHeight);
int thumbWidth = Decimal.ToInt32(sizeRatio * thumbHeight);
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();
}

I did forget to mention in last week's post, the .NET classes you need to import for the .NET code to run.  Those are:

using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

Categories .NET, ColdFusion | Tags:

Leave a Reply or Return to Top