How to crop an image that is zoomed(zoomed in/out)

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How to crop an image that is zoomed(zoomed in/out). Cropping works fine when the image is normal, that is not zoomed. I have used a panel whose AutoScroll property is true and a picturebox inside the panel whose sizemode property is AutoSize and BackgroundImageLayout is Tile.

Load image:

C#

Image img = Image.FromFile("filepath");
picBoxImageProcessing.Image = img;

zoom in:

C#

 zoomFactor += 1;
 picBoxImageProcessing.Size = new  Size((img.Width * zoomFactor), (img.Height * zoomFactor));
picBoxImageProcessing.SizeMode = PictureBoxSizeMode.StretchImage;

cropping:
Draw a rectangular shape on the image and then crop.

C#

Crop(Image img, Rectangle r)
{
//
}

In this way when i zoom in first and then select a specific region drawing a rectangle on the zoomed image and then crop then another region is cropped rather than i have selected.
I have got many application for image processing but I couldn't solve my problem.

thanks in advance.

Posted 14-Feb-12 19:41pm

akul123

Updated 14-Feb-12 19:42pm

v2

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BillWoodruff 17-Feb-12 2:47am

Please confirm this a WinForms question, and that you are using WinForms Panel, and PictureBox controls.

Show us the code you use now to "select a specific region drawing a rectangle on the zoomed image and then crop" on the image at default (?) resolution: before you resize the image and set 'SizeMode to 'StretchImage.

Is there a particular reason you are using 'BackGroundImage 'Tile mode on the PictureBox ?

This (very old) article might give you an idea for a new approach:

http://www.bobpowell.net/zoompicbox.htm

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ajit_machhe · Answer 1 · 2012-03-02T03:52:00

from my point of view...

A WPF Custom Control for Zooming and Panning[^]

please refer the above link.

solution to you problem from my view would be like >>

select the rectangle to crop. then save the cropped image

then resize the iamage as per your requirement(zoom percent).

in croping and resizing i guess i can help.