A progressive JPEG will display in the web browser in several passes, with
more detail reveal with each pass. Programs like Photoshop allow you to
specify the number of scans for the JPEG image you are creating.
Sincerely,
Shane Witbeck
Webmaster
-----Original Message-----
From: Robert Everland [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, July 12, 2000 11:51 AM
To: '[EMAIL PROTECTED]'
Subject: RE: Thumbnail tags
Dumb question, what are progressive jpegs?
Bob
-----Original Message-----
From: ColdFusionKid [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, July 12, 2000 11:11 AM
To: [EMAIL PROTECTED]
Subject: Re: Thumbnail tags
I'd use Jukka Manner's updated CFX_Image tag instead of the old CFX_GifGD
tag. It has support for progressive jpegs as far as I can tell, it also has
much more features.
----- Original Message -----
From: "Seth Petry-Johnson" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, July 11, 2000 8:30 PM
Subject: Re: Thumbnail tags
> > I've been using cf_gifgd from the tag gallery
> > works good for me, but progressive jpg's will
> > break it. If anyone has any better solutions I'd
> > like to know also.
>
> I too have been stuck with cfx_gifgd and its problems with progressive
> JPEGs. I've looked, but haven't found anything that is a good replacement.
> If anyone knows of a good alternative, I too would be very interested.
>
> However, I do know how to test for progressive JPEGs before resizing them.
> The problem is that when CFX_GIFGD is called to resize a progressive JPEG
it
> causes the entire CF service to crash and restart, which is obviously a
bad
> thing. I don't know enough about JPEGs (or the CFX code) to know why this
> is.
>
> To ensure that this won't happen, use CFX_GIFGD to read the file before
you
> resize it. The READ action returns a series of variables about the image,
> one of which is the file type. If the image is a progressive JPEG the
type
> variable will contain an empty string. Just wrap the resize action in a
> CFIF that checks the length of the type variable.
>
> For example:
>
> <!--- check the file type --->
> <CFX_GIFGD ACTION="read" FILE="#yourFile#">
> <CFIF NOT Len(Trim(Variables.IMG_TYPE))>
> <!--- progressive JPEG! put some sort of error message here --->
> <CFELSE>
> <!--- image can be safely resized --->
> <CFX_GIFGD ACTION="resize" blah blah>
> </CFIF>
>
> Just a little workaround I discovered. Hope it helps.
>
> Regards,
> Seth Petry-Johnson
> Argo Enterprise and Associates
>
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