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Image Cropping with Image Resizing Using VB.NET

, 17 Jun 2008 CPOL
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Simple Image Cropping with Image Resizing Using VB.NET



This article discusses simple image cropping with image resizing using VB.NET for developers.


I wondered once upon a time about image cropping. I learned and understand that there are many simple image cropping techniques available compared to other cropping technology currently available.

Using the Code

This article discusses simple image cropping using VB.NET.

In this article, I discuss simple image cropping by using the common events like mouse move, mouse down, mouse up and button Click events.

I would like to discuss image cropping using five steps only. You need to follow these steps only.

The steps are as listed below:

  1. Load the image
  2. Crop the image
  3. Capture the image
  4. Resize the image (if you need)
  5. Save the image

Before we start creating, we need 2 picture box controls (PreviewPictureBox, crobPictureBox), 3 buttons (save, Cancel, open), 1 trackbar (resizingTrackBar) and some labels. Hey, this seems like cooking specifications.

The steps are briefly described below:

1. Load the Image

The image can load to the picture box using file open dialog box and be made to show by means of bitmap display method, i.e.:

PreviewPictureBox.Image = System.Drawing.Bitmap.FromFile(openDlg.FileName)
crobPictureBox.Image = System.Drawing.Bitmap.FromFile(openDlg.FileName)    
'*********PreviewPictureBox and crobPictureBox are 
'the cropping and previewing pictureboxes  

This can done either in form load or Button click events.

2. Crop the Image

The image can crop from the picture box using mouse move and mouse down events. This is possible by getting the x and y axis using the above events, i.e.:

cropX = e.X
cropY = e.Y
cropPen = New Pen(cropPenColor, cropPenSize)    
cropPen.DashStyle = DashStyle.DashDotDot          
'*************You have to create Colors(cropPenColor) 
'and Size(cropPenSize) to draw the doted lines  

You can see the styles that I applied to specify the selected area by DashStyle.DashDotDot. And also by crobPictureBox.CreateGraphics.DrawRectangle(cropPen, cropX, cropY, cropWidth, cropHeight).

3. Capture the Image

The image is captured only by using mouse up event, and the cropped image is set to Bitmap class which makes a image and sets the created image for preview, i.e.:

Dim bit As Bitmap = New Bitmap(crobPictureBox.Image, _
	crobPictureBox.Width, crobPictureBox.Height)
g.DrawImage(bit, 0, 0, rect, GraphicsUnit.Pixel)
PreviewPictureBox.Image = cropBitmap    

4. Resize the Image

If you want to resize the image, you can use the trackbar to resize the image. I prescribe use of a high quality image for resizing which results in quality cropped and resized images.

scale_factor = Integer.Parse(resizingTrackBar.Value)         
img1.Image = cropBitmap
bm_source = New 
Bitmap(img1.Image)  bm_dest = New Bitmap( _
CInt(bm_source.Width * scale_factor), _
Int(bm_source.Height * scale_factor))   
Dim gr_dest As Graphics = Graphics.FromImage(bm_dest)
gr_dest.DrawImage(bm_source, 0, 0, bm_dest.Width + i, bm_dest.Height + i)
PreviewPictureBox.Image = bm_dest
'*************Image resizing is done by means of getting the values from trackbar  

5. Save the Image

The cropped image may be a low quality one which leads to image distortion. I tried my level best to make the image with good quality. I used SmoothingMode, CompositingQuality, InterpolationMode and EncoderParameter(myEncoder, 60L) properties to make the images.

Points of Interest

In the above steps and coding methodology, you find simplicity. This is what I meant to do. All coders should use simple technique in an optimized manner for complicated issues.


  • 17th June, 2008: Initial post


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Senthil Sambandam
Software Developer (Senior)
India India
No Biography provided
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Comments and Discussions

Questionresize rectangel PinmemberMember 1116588130-Oct-14 6:33 
QuestionAnother simple image cropping/resizing method PinmemberDina_Du20-Jun-13 19:19 
QuestionThanks Pinmemberraveena_ff12-Jun-13 3:37 
QuestionNeed Help Additing,Selecting,Moving Shapes to picture box Pinmemberrexpertq21-May-13 3:54 
GeneralMy vote of 5 Pinmemberyasir.koplak6-May-13 0:00 
GeneralMy vote of 4 Pinmemberdedyfuadi31-Mar-13 21:37 
GeneralMy vote of 5 PinmemberJohn L Bird25-Sep-12 2:49 
QuestionAcquiring Images from Scanners Image Cropping with Image Resizing Save Image to Specific folder PinmemberAnbarasan Gopal28-Aug-12 11:37 
GeneralImage Cropping with Image Resizing Using VB.NET PinmemberVovaZ21-Apr-12 19:25 
GeneralMy vote of 5 PinmemberMember 820778419-Mar-12 5:35 
GeneralMy vote of 5 Pinmembermanoj kumar choubey20-Feb-12 23:06 
QuestionDear Sir, Pinmemberibrahimsediq8-Feb-12 20:38 
SuggestionVery good PinmemberEugen-GM23-Jan-12 11:02 
QuestionMissing Return Statement Pinmemberjason272618-Jan-12 22:26 
QuestionHow to open a image in photoshop using Pinmembersuccessprabhu4-Dec-11 18:34 
AnswerRe: How to open a image in photoshop using PinmemberMember 476416514-Jan-12 1:58 
GeneralMy vote of 5 Pinmemberthilina_SAMPATH29-Aug-11 18:41 
GeneralMy vote of 5 Pinmemberaalhanane9-Jun-11 5:14 
GeneralMy vote of 5 Pinmemberdim1317-Dec-10 11:40 
GeneralMy vote of 5 PinmemberManojDancer23-Sep-10 3:44 
GeneralMy vote of 4 PinmemberNiranjan0017-Jul-10 1:08 
Questionproblem in cropping PinmemberMember 400159626-Jun-10 1:11 
GeneralReq for Poly shape Pinmembernaraimha27-Dec-09 23:50 
Questionhow to convert bmp image to hexa conversion ??? Pinmemberm2kannan29-Sep-09 22:07 
GeneralMy vote of 2 PinmemberMaxxi867-Sep-09 23:17 

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