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Thread: aspect-ratio-based canvas resize

  1. #1

    Default aspect-ratio-based canvas resize

    I apologize if this has been posted elsewhere or is obvious. I've tried the various menus and can't find the proper settings.

    Is it possible to batch do this with irfanview?
    make the pic a specific aspect ratio by adding borders either on top+bottom, or left+right, but without modifying the image in any other way (the dimensions of the image, without counting the border, is still the same).

    I describe the problem somewhat better in this thread (with sample pictures of what I want done)
    http://newsgroup.xnview.com/viewtopic.php?f=35&t=26889

    notes: the options seem to be in percentage, or fixed number of pixels, but not as percentage of the opposite side (that'd solve the problem. by opposite side, I mean new_width = old_width; new_height = 1.5 x old_width )
    the pics are of various sizes (they're scans)
    the object of this to avoid automatic cropping from print centers like costco or walmart (they don't have an option to not crop; the option to add white borders just makes the cropped image smaller, and adds borders on all four sides - kind of stupid IMHO)

    PS: if this has to be scripted, can it be done so that the pixel parity is checked and adjusted for? the reason is if we canvas resize from 1500 to 1551 for instance, there will be 1/2 pixel interpolation. we just add a pixel to make it from 1500 to 1552.

  2. #2
    Professional User Mij's Avatar
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    Default

    Hi
    What you ask is possible using a script file written in something like VBS but I cannot think of an elegant way to do it. I think it would need the following steps for each image file;

    1. Call Irfanview using the /info=txtfile option to get the image Width and Height
    2. Calculate required Width and Height of new image having correct aspect ratio
    3. Modify i_view32.ini file to insert new values into CanvW and CanvH parameters
    4. Call Irfanview again using the /Advancedbatch option to make the change

    I have done all these things before in VBS scripts and they worked OK but I would expect that it would take 2-3 seconds per image due to all the opening and closing of Irfanview, so your 1000 images will take a while to process.

    However is it really necessary to do it this way? Can you not just resize, keeping aspect ratio, to fit within a fixed size of say 1200x800 and then Add canvas (centered) to add borders to the appropriate sides? 1200x800 would give a 6x4in print at 200DPI which is probably about what Costco would scale it down to anyway.
    You could do that with a standard Batch Conversion/Rename process from the Irfanview GUI - see example below.

    Click image for larger version. 

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    Edit: You would probably have to sort your images first into portrait and landscape formats so that you could resize a portrait batch to 800x1200 and a landscape batch to 1200x800. You can do that fairly easily in the Thumbnail window.
    Last edited by Mij; 17.10.2012 at 06:21 PM.

  3. #3

    Default

    Sorry to bump and old post but this is exactly what I'm trying to do. Been looking at other software as well. Does anyone know of a method to do this?

    Images are all different sizes and aspect ratios, basically random.

    End goal: All images 750px x 563px without losing any of the image

    Current process:
    Add white borders to the sides or the top and bottom to correct aspect ratio
    Resize image

    In the future I can foresee needing the images in different sizes with the same aspect ratio. If I can get the aspect ratio corrected and keep the images at full size I can then create new batches as needed for different sizes.

    Learning VB script isn't something I'm to keen on at the moment. I may be willing to pay someone that is up to the task.

  4. #4

    Default

    Well I decided to start playing with a VBScript. I seem to be getting close but am stuck at the moment.

    The script is using Irfanview to create an info file. I'm reading the dimensions from the file. Doing the math to get the new dimensions and then writing them to the ini file.

    Error I'm getting:

    Well I was but typing up this post I found the issues.

    This is _VERY_ rough code but thought I would post it up for others to use. I'm sure it's not very efficient and could us a lot of help so use at your own risk! Allows you to drag and drop pictures like this video:
    http://www.youtube.com/watch?v=t-WcdWpuDoI

    Decided to clean up the code a bit will repost it shortly...
    Last edited by Muttley; 22.05.2013 at 07:50 PM.

  5. #5

    Default

    Okay cleaned up the code a bit. I provide no support! Use at your own risk. Best you have a programming understanding before trying to mess with the mess that I made

    ' Based on
    ' Nioi Pier Giuliano

    ' http://piergiu.wordpress.com/

    ' purpose of this script:
    ' resizes images with irfanview and saves them in the script folder

    ' Modified to create images with a specific aspect ratio
    ' Various Code noted below from:
    ' blogs.technet.com/b/heyscriptingguy/


    '----------------------DO NOT modify this----------------------------
    set objShell = wscript.createObject("wscript.shell")
    set objFSO = CreateObject("Scripting.FileSystemObject")

    DIM exe,switch,convert,all,width,height,installationPa th,info,genText,iniLocation,iniFile
    Const ForReading = 1
    Const ForWriting = 2
    '--------------------------------------------------------------------


    '-----------------PLEASE DO modify this at your needs----------------
    installationPath = "C:\Program Files (x86)\IrfanView\"
    runLocation = "C:\Users\Tim\Desktop\Temp"
    iniLocation = "C:\Users\Tim\Desktop\Temp"
    '--------------------------------------------------------------------


    '----------------------Set command line strings----------------------------
    exe = "CMD /C " & """" & installationPath & "i_view32.exe" & """"
    iniFile = runLocation & "\i_view32.ini"
    info = " /info=" & runLocation & "\fileInfo.txt"
    switch = " /advancedbatch /ini=" & iniLocation & " /convert="

    '----------------------Execute----------------------------
    scriptFolder = objFSO.GetParentFolderName(Wscript.ScriptFullName)

    For Each a In WScript.Arguments

    set objFile = objFSO.GetFile(a)
    convert= "$D$N_test.jpg" 'Uses IrfanView patterns to name new file
    'Alternate file naming option
    'convert= scriptFolder & "\" & objFSO.GetBaseName(objFile) & "_rid." & objFSO.GetExtensionName(objFile)
    '----------------------Generate text file----------------------------
    genText= exe & " " & a & info
    iReturn = objShell.Run(genText, , True)
    'WScript.Echo all
    '----------------------Retrieve dimensions----------------------------
    '--Get the current height and width from fileInfo.txt
    '-- Code from http://blogs.technet.com/b/heyscript...xt-file.aspx--

    Set objFSO = CreateObject("Scripting.FileSystemObject")
    Set objFile = objFSO.OpenTextFile("C:\Users\Tim\Desktop\Temp\fil eInfo.txt")

    Do Until objFile.AtEndOfStream
    strData = ""
    strSearchString = objFile.ReadLine

    intStart = InStr(strSearchString, "Image dimensions = ") 'Find the start of pic dimensions

    If intStart <> 0 Then
    intStart = intStart + 19
    strText = Mid(strSearchString, intStart, 50)'strText will contain both dimensions
    strWidth = "" 'null the value

    For i = 1 to Len(strText)
    If Mid(strText, i, 1) = " " Then
    Exit For
    Else
    strWidth = strWidth & Mid(strText, i, 1)'strWidth just has the width
    End If
    Next
    End If
    Loop

    intStart2 = InStr(strText, "x")'find the start of heigth dimension
    intStart2 = intStart2 + 2

    strText2 = Mid(strText, intStart2, 10)
    strHeight = "" 'null the value

    For i = 1 to Len(strText2)
    If Mid(strText2, i, 1) = " " Then
    Exit For
    Else
    strHeight = strHeight & Mid(strText2, i, 1)'strHeight is the height
    End If
    Next


    '----------------------Analyze dimensions----------------------------
    '--Determine which dimension needs to be larger
    '--Modify this section to determine the new image size
    intWidth = clng(strWidth)
    intHeight = clng(strHeight)

    If intWidth/intHeight > 1.33 Then
    If intWidth/intHeight < 1.34 Then
    widthNew = intWidth
    heightNew = intHeight
    Else
    widthNew = intWidth
    heightNew = round(intWidth/4*3)
    End If
    Else
    widthNew = round(intHeight*4/3)
    heightNew = intHeight
    End If


    '----------------------New Dimensions----------------------------
    '--Write to ini file the new dimensions CanvW and CanvH
    '-- Code from http://blogs.technet.com/b/heyscript...-a-script.aspx --


    Set objFSO = CreateObject("Scripting.FileSystemObject")
    Set objTextFile = objFSO.OpenTextFile(iniFile, ForReading)
    strNewFile = "" 'null the value

    Do Until objTextFile.AtEndOfStream
    strNextLine = objTextFile.Readline

    intLineFinder = InStr(strNextLine, "CanvW")
    If intLineFinder <> 0 Then
    strNextLine = "CanvW=" & widthNew
    End If

    intLineFinder = InStr(strNextLine, "CanvH")
    If intLineFinder <> 0 Then
    strNextLine = "CanvH=" & heightNew
    End If

    strNewFile = strNewFile & strNextLine & vbCrLf
    Loop

    objTextFile.Close

    Set objTextFile = objFSO.OpenTextFile(iniFile, ForWriting)

    objTextFile.WriteLine strNewFile
    objTextFile.Close


    '----------------------Execute conversion----------------------------
    all= exe & " " & a & switch & convert
    iReturn = objShell.Run(all, , True)
    'WScript.Echo all

    Next
    '--------------------------------------------------------------------

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