Solved

Bitmap Image Too Large

Posted on 2010-08-20
4
690 Views
Last Modified: 2012-06-27
I have code that add a company logo as a water mark to photos and then saves them back as a jpg.  Original images are 35kb, but the new image is 600kb.  The watermark is 3kb.  1) why is the new file so large?  2) How can I save these smaller?  
' Copy the foreground image into a bitmap.

        Dim phototouse As String

        phototouse = "C:\inetpub\wwwroot\watermark.png"        



        Dim picForeground As System.Drawing.Bitmap = New System.Drawing.Bitmap(phototouse)

        Dim fg_wid As Integer = picForeground.Width

        Dim fg_hgt = picForeground.Height

        Dim fg_bm As New Bitmap(fg_wid, fg_hgt)

        Using gr As Graphics = Graphics.FromImage(fg_bm)

            gr.DrawImage(picForeground, 0, 0, fg_wid, fg_hgt)

        End Using



        ' Make the red pixels transparent.

        fg_bm.MakeTransparent(Color.White)



        Dim photo As String = photoname

        ' Make the result bitmap.

        Dim picBackground As System.Drawing.Bitmap = New System.Drawing.Bitmap(localfolder & photo)

        Dim bg_wid As Integer = picBackground.Width

        Dim bg_hgt = picBackground.Height

        Dim bg_bm As New Bitmap(bg_wid, bg_hgt)

        If cy = 0 And cx = 0 Then

            'Need to position photo in far left corner b/c pattern not found

            cx = 0 ' Set to zero for logo in left bottom corner, set to bg_wid - 90 for logo in bottom right corner

            cy = bg_hgt - 20

        Else

            'pattern found, adjust to cover the pattern

            cx = cx - 2

            cy = cy - 11

        End If

        Using gr As Graphics = Graphics.FromImage(bg_bm)

            gr.DrawImage(picBackground, 0, 0, bg_wid, bg_hgt)



            ' Draw the foreground image on top.

            gr.DrawImage(fg_bm, cx, cy, fg_wid, fg_hgt)

        End Using



        ' Display the result.

        Dim destfile As String = localfolder & photonewname

        bg_bm.Save(destfile)



        ' We don't need the foreground bitmap any more.

        fg_bm.Dispose()

Open in new window

0
Comment
Question by:azyet24
  • 3
4 Comments
 

Author Comment

by:azyet24
ID: 33490083
Attached are three images: original image, modified image and watermark

Comment by WallyMod.  Author requested the photos be removed as they contain the corporate identity.  Since the photos are not necessary for understanding of the question they have accordingly been removed.

WallyMod
Community Supoport Moderator
0
 
LVL 3

Accepted Solution

by:
rojasc earned 500 total points
ID: 33490095
I think you are saving a bmp file in line 40 without jpeg compression


please read this page:
http://msdn.microsoft.com/en-us/library/bb882583.aspx
0
 

Author Comment

by:azyet24
ID: 33490125
rojasc, that worked great.  50% the photo is same size as original and quality looks good. thanks.
0
 

Author Comment

by:azyet24
ID: 33490130
Attached is the code from http://msdn.microsoft.com/en-us/library/bb882583.aspx that rojasc suggested
Private Sub VaryQualityLevel()

        ' Get a bitmap.

        Dim bmp1 As New Bitmap("c:\TestPhoto.jpg")

        Dim jgpEncoder As ImageCodecInfo = GetEncoder(ImageFormat.Jpeg)



        ' Create an Encoder object based on the GUID

        ' for the Quality parameter category.

        Dim myEncoder As System.Drawing.Imaging.Encoder = System.Drawing.Imaging.Encoder.Quality



        ' Create an EncoderParameters object.

        ' An EncoderParameters object has an array of EncoderParameter

        ' objects. In this case, there is only one

        ' EncoderParameter object in the array.

        Dim myEncoderParameters As New EncoderParameters(1)



        Dim myEncoderParameter As New EncoderParameter(myEncoder, 50&)

        myEncoderParameters.Param(0) = myEncoderParameter

        bmp1.Save("c:\TestPhotoQualityFifty.jpg", jgpEncoder, myEncoderParameters)



        myEncoderParameter = New EncoderParameter(myEncoder, 100&)

        myEncoderParameters.Param(0) = myEncoderParameter

        bmp1.Save("c:\TestPhotoQualityHundred.jpg", jgpEncoder, myEncoderParameters)



        ' Save the bitmap as a JPG file with zero quality level compression.

        myEncoderParameter = New EncoderParameter(myEncoder, 0&)

        myEncoderParameters.Param(0) = myEncoderParameter

        bmp1.Save("c:\TestPhotoQualityZero.jpg", jgpEncoder, myEncoderParameters)



    End Sub 'VaryQualityLevel







...





Private Function GetEncoder(ByVal format As ImageFormat) As ImageCodecInfo



    Dim codecs As ImageCodecInfo() = ImageCodecInfo.GetImageDecoders()



    Dim codec As ImageCodecInfo

    For Each codec In codecs

        If codec.FormatID = format.Guid Then

            Return codec

        End If

    Next codec

    Return Nothing



End Function

Open in new window

0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Microsoft Reports are based on a report definition, which is an XML file that describes data and layout for the report, with a different extension. You can create a client-side report definition language (*.rdlc) file with Visual Studio, and build g…
Calculating holidays and working days is a function that is often needed yet it is not one found within the Framework. This article presents one approach to building a working-day calculator for use in .NET.
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …
This Micro Tutorial demonstrates using Microsoft Excel pivot tables, how to reverse engineer competitors' marketing strategies through backlinks.

863 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now