Comments on: Design of an Image Resizing Module http://nathanaeljones.com/196/design-of-an-image-resizing-module/ Ramblings of a computer linguist Sat, 20 Feb 2010 18:58:00 +0000 http://wordpress.org/?v=2.9 hourly 1 By: Nathanael Jones http://nathanaeljones.com/196/design-of-an-image-resizing-module/comment-page-1/#comment-170 Nathanael Jones Mon, 09 Nov 2009 14:09:15 +0000 http://66.29.219.39/?p=196#comment-170 I'm sure it is very fast when you only are requesting one image at a time. I suggest trying it with a large photo (say a 5MB jpeg) and placing 100 images on a page to help simulate concurrent users. Make sure to watch your w3p.exe memory use during that time. Have you read the article on image resizing pitfalls? I don't want to repeat anything that you've already read. I’m sure it is very fast when you only are requesting one image at a time. I suggest trying it with a large photo (say a 5MB jpeg) and placing 100 images on a page to help simulate concurrent users.
Make sure to watch your w3p.exe memory use during that time.

Have you read the article on image resizing pitfalls? I don’t want to repeat anything that you’ve already read.

]]> By: Jonesy http://nathanaeljones.com/196/design-of-an-image-resizing-module/comment-page-1/#comment-143 Jonesy Fri, 06 Nov 2009 11:17:51 +0000 http://66.29.219.39/?p=196#comment-143 Nathanael, What do you think of this in-memory Database solution (VB)? It's damn fast: (Core is just a helper module that returns a blob from an SQL server table) Dim arrImage As Byte() = Core.data_select_image("select blobImage from tblMyTable where intMyTablePK = " & context.Request.QueryString("imageID"), "blobImage", context.Server.MapPath(".")) If Not arrImage Is Nothing Then Dim bmp As Bitmap = CType(Bitmap.FromStream(New MemoryStream(arrImage)), Bitmap) Dim output As Bitmap = New Bitmap(bmp, New Size(100, 100)) context.Response.Clear() context.Response.ContentType = "image/jpeg" output.Save(context.Response.OutputStream, ImageFormat.Jpeg) context.Response.End() End If Obviously we can pass in the thumbnail dimensions, but it's fine for most users needs (20 - 100 images on a page for example). The code lives in a handler page for speed - getimage.ashx or whatever. Nathanael,

What do you think of this in-memory Database solution (VB)? It’s damn fast:
(Core is just a helper module that returns a blob from an SQL server table)

Dim arrImage As Byte() = Core.data_select_image(“select blobImage from tblMyTable where intMyTablePK = ” & context.Request.QueryString(“imageID”), “blobImage”, context.Server.MapPath(“.”))

If Not arrImage Is Nothing Then
Dim bmp As Bitmap = CType(Bitmap.FromStream(New MemoryStream(arrImage)), Bitmap)
Dim output As Bitmap = New Bitmap(bmp, New Size(100, 100))
context.Response.Clear()
context.Response.ContentType = “image/jpeg”
output.Save(context.Response.OutputStream, ImageFormat.Jpeg)
context.Response.End()
End If

Obviously we can pass in the thumbnail dimensions, but it’s fine for most users needs (20 – 100 images on a page for example). The code lives in a handler page for speed – getimage.ashx or whatever.

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