Re: saved bitmap size

Hi supra, thanks for your answer, it works but in some picture programms it
gives a warning because it's actualy a jpeg image with a bmp extension

Greetz Peter

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i proost,
i created  compressed bmp. there is not control to be added.

Option Explicit On
Option Strict Off
Imports System.Drawing.Imaging
Imports System.IO
Module ImageCompression

    Private Function GetEncoderInfo(ByVal mimeType As String) As
ImageCodecInfo
        Dim i As Integer
        Dim Encoders() As ImageCodecInfo =
    

ImageCodecInfo.GetImageEncoders()
  

        For i = 0 To Encoders.Length - 1
            If Encoders(i).MimeType = mimeType Then
                Return Encoders(i)
            End If
        Next
        Return Nothing
    End Function

    Public Sub main()
        Dim codecInfo As ImageCodecInfo = GetEncoderInfo("image/jpeg")
        Dim enc As Encoder = Encoder.Quality
        Dim EncParams As New EncoderParameters(1)
        Dim Dir As New DirectoryInfo(Directory.GetCurrentDirectory())
        Dim image As Image = image.FromFile("C:\Documents and
Settings\My Documents\Visual Studio Projects\VbNet\project\Image
Compression\bin\supra_1.bmp")
        Dim jpgName As String
        EncParams.Param(0) = New EncoderParameter(enc, 25L)
        jpgName = Path.GetFileNameWithoutExtension("C:\Documents and
Settings\My Documents\Visual Studio Projects\VbNet\project\Image
Compression\bin\supra_1.bmp") & "0" & ".bmp"
        image.Save(jpgName, codecInfo, EncParams)
    End Sub
End Module

hth.
regards

Peter Proost wrote:

    

Hi group, I've got a question about the size of a saved bitmap.
What I need to do is open a bitmap if it needs resizing, resize and save
      

it.
  

This isn't a problem, but the problem I have is that the original image
      

has
  

got an 8 bit indexed pixelformat,
but you can't create a graphics object for this pixelformat so my bitmap
uses the default pixelformat:
Format32bppArgb, but this ofcourse result in a much larger file size
      

(420kB
  

instead of 106kB)
I know I can use for example Format24bppRgb and this reduces the size to
300kB but I would like to know if I there's a way I can keep the size at
106kB

Thanks in advance

Greetz Peter