Is opportunity to resize images resource-intensive?

Hello to ALL!!!
I'm trying to make a site with image gallery(for example -
pets).And I've thought about optimal size of full image. I've
chosen 640x480. And I'm going to use <imageresize> command
for images greater than 640/640. But I don't know(in practice) is
it a good idea to give opportunity to people to resize their images
with code of my site? I mean how resource-intensive this process
for a server? And what will happen if for example 500 people will
want to make "resize operation" at the same time?
Thank you for your coments/answers!

if you are seriously going to have 500 people resizing at
once, I would
suspect you might have issues.
But for just average occasional uploads, you should be fine.
In my work so far with simple or even large batch resizing, I
have not
seen any major drag.
In fact I am overall very impressed with the speed and
quality of image
resizing in CF8.
a bit OT:
here's a post about some code i've been working on for
batch-resizing in
multiple folders, coupled with a jquery photo gallery ... if
you *or any
other cf users* are interested, I am looking for testers
http://www.miuaiga.com/index.cfm/2008/10/14/CF-Gallery-Creator--jQuery-Slider-Gallery
Michael Evangelista, Evangelista Design
Web : www.mredesign.com Blog : www.miuaiga.com
Developer Newsgroups: news://forums.mredesign.com

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Background :
I am working on a small .NET application which reads the tiff file and performs some metadata related operations on it.
The program works fine with all of the tiff Images that are taken from photoshop. I have recieved a tiff file from the client which does not work with the program.
I checked the metadata info for the file using imagemagik following is the output
Format: TIFF (Tagged Image File Format)
Mime type: image/tiff
Class: DirectClass
Geometry: 6986x3754+0+0
Resolution: 96x96
Print size: 72.7708x39.1042
Units: PixelsPerInch
Type: TrueColorAlpha
Base type: TrueColor
Endianess: MSB
Colorspace: sRGB
Depth: 8-bit
Channel depth:
    red: 8-bit
    green: 8-bit
    blue: 8-bit
    alpha: 8-bit
Channel statistics:
    Red:
      min: 37 (0.145098)
      max: 255 (1)
      mean: 215.041 (0.843299)
      standard deviation: 48.8483 (0.191562)
      kurtosis: 0.845012
      skewness: -1.09632
    Green:
      min: 25 (0.0980392)
      max: 255 (1)
      mean: 213.399 (0.836859)
      standard deviation: 50.853 (0.199424)
      kurtosis: 0.908226
      skewness: -1.09806
    Blue:
      min: 21 (0.0823529)
      max: 255 (1)
      mean: 210.495 (0.825471)
      standard deviation: 53.6527 (0.210403)
      kurtosis: 0.124965
      skewness: -0.929882
    Alpha:
      min: 64 (0.25098)
      max: 255 (1)
      mean: 254.948 (0.999796)
      standard deviation: 2.56957 (0.0100768)
      kurtosis: 2437.44
      skewness: 49.3893
Image statistics:
    Overall:
      min: 0 (0)
      max: 255 (1)
      mean: 159.747 (0.626458)
      standard deviation: 44.321 (0.173808)
      kurtosis: 48.4205
      skewness: -8.00071
Rendering intent: Perceptual
Gamma: 0.454545
Chromaticity:
    red primary: (0.64,0.33)
    green primary: (0.3,0.6)
    blue primary: (0.15,0.06)
    white point: (0.3127,0.329)
Background color: white
Border color: srgba(223,223,223,1)
Matte color: grey74
Transparent color: none
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 6986x3754+0+0
Dispose: Undefined
Iterations: 0
Compression: LZW
Orientation: TopLeft
Properties:
    date:create: 2014-02-15T21:18:37+06:00
    date:modify: 2014-02-09T16:29:10+06:00
    signature: a5c4a9415437ee2d3b0c3d860b30c5367f73fe7553c3f54923caf6da4b9e4623
    tiff:alpha: unassociated
    tiff:endian: lsb
    tiff:photometric: RGB
    tiff:rows-per-strip: 3754
Artifacts:
    filename: C:\Users\Jane\TiffPathOperation\bin\Debug\Example1client_no_path.tiff
    verbose: true
Tainted: False
Filesize: 14.6MB
Number pixels: 26.23M
Pixels per second: 54.64MB
User time: 0.484u
Elapsed time: 0:01.479
Version: ImageMagick 6.8.7-4 2013-10-26 Q16 http://www.imagemagick.org
Unlike other tiff images this image does not contain 8bim profile information, which is required for proper execution of the program
Profiles:
Profile-8bim: 11720 bytes
Profile-icc: 3144 bytes
    Description: sRGB IEC61966-2.1
    Manufacturer: IEC http://www.iec.ch
    Model: IEC 61966-2.1 Default RGB colour space - sRGB
    Copyright: Copyright (c) 1998 Hewlett-Packard Company
Profile-xmp: 19368 bytes
Possible solution :
I would have to add the Image resource block data to such image in which the profile information is missing.
Problem :
I would have to write metadata for the tag 34377 as given in the Adobe Specification for the listed resource Id
How am I suppose to write this entire block and assign it to the Tag 34377 in C#?
What values should be added for each resource Id ?
Tiff Image : http://1drv.ms/NtzbCr

Bypassing the portion of the file is not a option in my case since a part
of the program reads the bytes and performs operation on the image when it
reads 8bim.
The image if re-saved in Photoshop gets the required metadata. (Can be seen
by using imagemagik's identify utility)
Only option that I have is to write the information for the resource in
side the Image resource block tag.
How am I suppose to write this resources when I am using BitmapMetadata
class?
Regards,
Charanraj Golla

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Tanveer

http://forum.java.sun.com/thread.jsp?forum=20&thread=522483

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Is opportunity to resize images resource-intensive?

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