Resize jpeg or gif for already uploaded images: aspupload aspjpeg resize images thumbnails

Resize jpeg or gif for already uploaded images

I currently have a working version of ASPJpeg that allows me to take an image (already uploaded to the server) and create a thumbnail version of that image and store it in a separate folder on the server. For jpegs, everything works great. However, I need it to work for gif images. Currently, if I try to resize a gif that has a transparent area, the current setup doesn't handle the transparency well. I have read at Persits software that the ASPJpeg function now has gif capability but the gif management object is handled separately. In other words, I need to know that I am working with a gif image before using it.

My problem then is how to identify whether the image that I want to resize is a jpeg or a gif. As a reminder, I have already uploaded the image to the server and that can't change. And, after identifying whether it is a jpeg or a gif (the only two types of image that I allow), then to set up the code to handle jpegs using the 'regular' ASPJpeg method and the gifs using the special gif management that comes within the newest version of ASPJpeg.

Sub createThumb
	dim str1, str2
	dim col, finalpath
	' Create an instance of AspJpeg
	Set Jpeg = Server.CreateObject("Persits.Jpeg")
	Path = Server.MapPath("../Folders/lib" & Store_ID) & "\"& ImageL_file_name
		' Open source image
	Jpeg.Open Path
	Jpeg.PreserveAspectRatio = True
	Jpeg.Quality = 100 ' this controls the degree of loss of quality. 
 
	'run a select case to determine how the image will be manipulated
	select case var_option
	case "percent"
		Scale = var_imagePercent
		Jpeg.Width = Jpeg.OriginalWidth * (Scale / 100)
		Jpeg.Height = Jpeg.OriginalHeight * (Scale / 100)
	case "height"
		jpeg.Height = var_imageHeight
		' Set new height, preserve original width/height ratio
	'	jpeg.Width = jpeg.OriginalWidth * (jpeg.Height / jpeg.OriginalHeight)
 
	case else
		jpeg.Width = var_imageWidth
	end select
 
	'Split "/"
	str1 = ImageL_file_name
 
	if CheckString(str1, "([/])") then
		col = Split(str1, "/")
		series = ubound(col)'use uBound to deal with deep directories
		finalpath = col(series)
	else
		finalpath = str1
	end if
	' Create thumbnail and save it to disk
	Jpeg.Save Server.MapPath("../Folders/lib" & Store_ID & "/Store_Thumb_Images") & "\small_"& finalpath
 
End Sub

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Resize jpeg or gif for already uploaded images

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