Jpeg or Tiff?

[Martin du Saire]

I have .jpg images that I am processing...let's assume they are the
best images I can obtain...

As long as I don't save any of the intermediate images, I'm not
introducing any format related artifacts, correct?

If I need to save an intermediate image for some reason, and then use
it later in the process, am I safe if I save it as .tif?

Thanks.

M

[Duane and Julie]

M,

On Mar 6, 2006, at 2:57 PM, Martin du Saire wrote:

> I have .jpg images that I am processing...let's assume they are the  
> best images I can obtain...

bummer...

>
> As long as I don't save any of the intermediate images, I'm not  
> introducing any format related artifacts, correct?

That is correct.  Format artifacts are introduced on save for JPEGs.

>
> If I need to save an intermediate image for some reason, and then  
> use it later in the process, am I safe if I save it as .tif?

Yes.  PNG or even GIF will also work.

>
> Thanks.
>
> M

[michael shaffer]

M writes ...

> I have .jpg images that I am processing...let's assume they
> are the best images I can obtain...
>
> As long as I don't save any of the intermediate images, I'm
> not introducing any format related artifacts, correct?
>
> If I need to save an intermediate image for some reason, and
> then use it later in the process, am I safe if I save it as .tif?

If [...], then correct on both points ...

Genuinely, Michael Shaffer  :o)

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[Robert Baer]

>> If I need to save an intermediate image for some reason, and then  use it
>> later in the process, am I safe if I save it as .tif?
>
> Yes.  PNG or even GIF will also work.
>
GIF images use a fixed color palette (generally, <=256 color), and probably
should be avoided if you have images that use a large portion of the RGB
color space.  Although 'lossless' upon repeated saves, the first save as
.gif could result in a reduction of your color space.

I would recommend sticking to your original idea of .tif (or if you prefer,
the .png suggestion).

Rob