Image Quality Lost When Saving An Image In JPEG Using Bitmap?

Dec 28, 2010

'm working on an Image Encrypting software which reads out all the pixels of an image and then relocating the pixels in some way.

My Code is as below

Dim Img As New Bitmap(tbEpath.Text)
Dim ImgSize As Integer = Img.Width * Img.Height
Dim Pixels(Img.Width, Img.Height) As Color

[code]....

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I have a routine that creates a report which includes text and graphics. When I print to a PDF or printer the output looks great. When I draw the report on an image to save as a PNG, GIF, JPEG, etc. it does not look as good and I understand that is related to the 96 dpi native resolution. However, I made some modifications, and even though the graphics part of the image looks better, the text does not look as good as the PDF. I am creating the image using 300 dpi and text rendering is set at the highest quality.

[Code]...

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Dim gr2 As Graphics = Graphics.FromImage(New Bitmap(800, 1000), Imaging.PixelFormat.Format32bppPArgb))

[code]......

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Oct 3, 2011

I am trying to edit an image. I can open the image with Picturebox1.load(mypicture)

I can change the pixels/edit the picture by Dim img as new bitmap(picturebox1.image)

[Code]...

now here is the weird part. When I save the image the filesize INCREASES..but the picture dimensions are the same Example... TEST.PNG 1.3KB, when opened up via picturebox/saved the image is now 2.3KB

not sure why...i even though I specify system.drawing.imaging.imageformat.PNG

samething with JPG... it actually SHRINKS it evenmore.. example 88KB jpeg.. saved as jpeg is now 47.7KB...

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Here is the code:

'Add images column to DataTable.
ds.Tables(0).Columns.Add("Image", GetType(BitmapImage))
'Create array of image paths.
Dim currentDir As String

[code]....

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I Tried To Check If Part Of Image Existing In Another Image

Explanation:

full image:

[Code]...

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I'm trying to pass an image showing to the user a countdown. For this, I'm using a separate thread where I'm checking when the countdown timer should be started, and when so, I draw an image for every 6 seconds passed.

What's annoying is when I pass the drawn image to the UI, the quality of the image is changed and it looks bad to the user.

This is my little script that handles the drawings:

Try
remainingTime = (#12:04:00 AM# - (DateTime.Now - local_DateTimeclick)).ToString("HH:mm:ss")
remainingTimeInSeconds = Convert.ToDateTime(remainingTime).Minute * 60 +

[Code]....

Also tried with changing the properties of g, but there was no positive effect.

what can i do to make this properly work without changing the quality of the returned image?

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[Code]...

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[Code].....

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[Code]...

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Mar 26, 2010

I'm using iTextSharp to print a PDF document. Everything goes ok until I have to print the company logo in it. First I noticed that the logo had poor quality, but after testing with several images, I realize that was the iTextSharp rendering it poorly.The test I did to say this was to print the PDF using my code and then edit the document with Acrobat 8.0 and I drew an image. Then printed the two documents and saw the noticeable difference.My question is that if anyone know if this can be due to a scaling problem where I'm failing to tell iTextSharp how it must render the image or is an iTextSharp limitation.

[Code]...

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I know what I need to do for all of it I just need to know how to save an image to a jpeg without it being compressed.  I have tried using the encoderparamters and getcodecinfo aswell as setting the quality to 100 but I still get a really bad looking image in the end.

Is there a way where I can save an image to a jpeg without getting the crappy image quality like with visual basic?

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How should I (can I?) produce a lower-quality image to paint when many quick redraws are taking place? Are there other strategies similar to this i can employ to increase performance (or fake increased performance.) [code]...

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Nov 16, 2010

What am i doing wrong on this code? im trying to get my form into a jpeg picture, but everytime it only saves a black screen of what im doing

Code:
Private Shared Function BitBlt(ByVal hdcDest As IntPtr, ByVal nXDest As Integer, _
ByVal nYDest As Integer, ByVal nWidth As Integer, ByVal nHeight As Integer, _
ByVal hdcSrc As IntPtr, ByVal nXSrc As Integer, ByVal nYSrc As Integer, ByVal _

[Code].....

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Alright, say I've made an animation in photoshop and exported it as a JPEG. I want to know if it's possible to change which frame of the animation the image will show. An example is if I made an image with 10 layers, and I want the 5th layer to show in a picturebox, how can I achieve this?

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Jul 8, 2009

So i am converting a metafile (EMF to be exact) to a jpeg or gif (doesn't matter as long as it's compatible with browsers) and when I do the conversion, all of the transparent pixels turn black. I have no idea how to do this in GDI+ but here is the method I am using to save the file:

Dim Img As System.Drawing.Imaging.Metafile = New System.Drawing.Imaging.Metafile(stream)
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I am trying to assign a button to let a resource ( JPEG image ) become the background of my form. But instead, the background becomes blank. Here is what I wrote:

Public Class Choose_Background
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[code]....

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Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim ScreenSize As Size = New Size(My.Computer.Screen.Bounds.Width, My.Computer.Screen.Bounds.Height)
Dim screenGrab As New Bitmap(My.Computer.Screen.Bounds.Width, My.Computer.Screen.Bounds.Height)

[code]....

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g.Clear(Color.White)
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g.Dispose()

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Private Sub CreateIcon(ByVal bitmapName As String)
Try
Dim fi As New System.IO.FileInfo(bitmapName)

[Code].....

But the problem is it only gives me a very low quality icon at the end. how to make a higher quality image?

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I'm trying to add an bitmap image in memory to a page using a System.Windows.Forms.PictureBox object, but it's not working. Here is my

HTML
Dim bytes As SqlBytes = reader.GetSqlBytes(0)
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[Code].....

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And, the error's kind of lengthly...
Error1Overload resolution failed because no accessible 'Save' can be called with these arguments:

'Public Sub Save(stream As System.IO.Stream, encoder As System.Drawing.Imaging.ImageCodecInfo, encoderParams As System.Drawing.Imaging.EncoderParameters)': Value of type 'String' cannot be converted to 'System.IO.Stream'.
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[Code] .....
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Imports System.Drawing
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[Code] ......
I am using this, however I get a GDI+ Unhandled Error.

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[Code]...

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I am trying to convert from a text file to an image(bitmap) file.
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[Code]....

The first step will be reading the data, so I created some VB codes:

Dim openFileDialog1 As New OpenFileDialog()
openFileDialog1.Filter = "Text Files (*.txt)|*.txt"
openFileDialog1.Title = "Select a text File"
' Show the Dialog.

' If the user clicked OK in the dialog and ' an image file was selected, open it.

If openFileDialog1.ShowDialog() = DialogResult.OK Then
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[Code]...

The second step will be converting the data to some data format which can be used in a bitmap image. This part is making me confused. Some codes I made is listed below:

[Code]....

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