How to change width without cropping image in VB.NET?

Question

0.00/5 (No votes)

See more:

I want to decrease width of image without losing its quality and without cropping it. When i am trying to decrease the width the image it becomes blurred. How can i resolve this? This is what i have tried so far.

What I have tried:

Dim barcode As Barcode128

barcode = BarcodeFactory.GetBarcode(Symbology.Code128)

barcode.Number = TextBox1.Text.ToUpper

barcode.Height = 120 Dim bitmap As Bitmap = barcode.Render()

Dim Cr As New Rectangle(5, 55, 130, 80) 'upperleft(x),upperleft(-y),right(-x),bottom(y)

Dim OrignalImage As Bitmap

OrignalImage = bitmap

Dim CropImage = New Bitmap(CropRect.Width, CropRect.Height

Using grp = Graphics.FromImage(CropImage)

grp.CompositingQuality = Drawing2D.CompositingQuality.HighQuality

grp.InterpolationMode = Drawing2D.InterpolationMode.HighQualityBicubic

grp.SmoothingMode = Drawing2D.SmoothingMode.HighQuality

grp.PixelOffsetMode = Drawing2D.PixelOffsetMode.HighQuality

grp.DrawImage(OrignalImage,New Rectangle(7,5,Cr.Width,Cr.Height),Cr, GraphicsUnit.Pixel)

PicBarCode.Image = CropImage

CropImage.Save("D:\bc.jpeg")

grp.Dispose()
End Using

Posted 9-Nov-20 23:25pm

Member 14548583

Updated 9-Nov-20 23:44pm

Add a Solution

Comments

[no name] 10-Nov-20 5:28am

You can't resize just one dimension and expect to maintain "aspect ratio".

Richard Deeming 10-Nov-20 5:30am

Saying you want to decrease the width of the image without losing quality and without cropping is like saying you want all of your shopping to be in one bag, but you don't want that bag to be heavy.

If you make the image dimensions smaller, you will inevitably lose some information.

Sandeep Mewara 10-Nov-20 5:52am

:laugh: :thumbsup:

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

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

OriginalGriff · Answer 1 · 2020-11-09T23:46:00

Tell me this: if I have a cubic box of tomatoes and I sit on it - lowering it's height by half - are the tomatoes inside still all round and perfect?

Of course not: I have reduced the volume of the box significantly, and squashed the fruits inside.

That's what happens when you reduce the width of an image without changing any other dimension: the pixels get "squashed together" and that means information has to be discarded in order to fit them in. This causes the "Blurring" you have noticed, and is fundamental to all images.

You cannot reduce width alone without throwing away pixels: either by "squashing them togther", or clipping them out of the image completely.