Re: JPEG's (Dave Camp)
Re: JPEG's (Dave Camp)
- Subject: Re: JPEG's (Dave Camp)
- From: Dave Camp <email@hidden>
- Date: Wed, 03 Jul 2002 07:34:40 -0700
I presume you are talking about Photoshop. I think that when you save a file
in Photoshop, it compresses a copy of the image and writes it to disk. Thus,
the image on screen does not suffer any loss of information. You can
continue to edit it and save again without penalty. This would continue to
work as long as you did not close the window.
To see the effects of re-compressing a file, you would need to save, close,
open, save again.
Dave
on 7/3/02 7:07 AM, Gary Smith at email@hidden wrote:
>
This came up at a WEB site development class I took 2 years ago
>
sponsored by the American Graphics Institute. The instructor
>
explained that if <Save> is used instead of <Save As...> there would
>
be no further degradation of the image with multiple saves.
>
>
How could this be?! I thought this was strange. This sounds to me
>
like parts of the image that are unmodified use existing compression
>
and only new pixels are run through the compression mashing of jpeg.
>
I never tested this because this class is what woke me up to the fact
>
that I don't like this
>
www-HTML-image-slicing-mapping-jpeg-gif-low-image-resolution stuff
>
and I should stay with my background in print.
>
>
I am curious to know if anyone else has heard of or tested this.
>
>
Gary Smith
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