Lossless JPG crop at set size or proportion?

On 21 Apr 2007 21:10:18 -0700, cpliu <spamfreeliu.TakeThisOut@yahoo.com> wrote:

>I use JPEGCrop to crop JPEG files. It works fine but I am looking for
>a cropping tool that can crop at certain ratio (eg. 4x3) or predefined
>size (eg. 800x600). I've read some posts here but still can't find an
>answer.
>
>Thanks for the help,
>
>liu

are you running any of the CS versions?

Dave
 >> Stay informed about: Lossless JPG crop at set size or proportion? 

"cpliu" <spamfreeliu DeleteThis @yahoo.com> wrote in message
news:1177228723.748065.24370@n59g2000hsh.googlegroups.com...
> On Apr 22, 12:33 am, Dave <d... DeleteThis @d.durbs> wrote:
>> On 21 Apr 2007 21:10:18 -0700, cpliu <spamfree... DeleteThis @yahoo.com> wrote:
>>
>> >I use JPEGCrop to crop JPEG files. It works fine but I am looking for
>> >a cropping tool that can crop at certain ratio (eg. 4x3) or predefined
>> >size (eg. 800x600). I've read some posts here but still can't find an
>> >answer.
>>
>> >Thanks for the help,
>>
>> >liu
>>
>> are you running any of the CS versions?
>>
>> Dave
>
> I use Photoshop 7 although I have access to CS2. Does CS2 have
> lossless JPEG?
>

I have never heard of lossless Jpeg! every time you save a jpeg you are
given a choice of compression and even at the least compression there will
be some loss however minor!
 >> Stay informed about: Lossless JPG crop at set size or proportion? 

On Sun, 22 Apr 2007 09:24:06 +0100, "Harry Limey"
<harrylimey.RemoveThis@inbox.com> wrote:

>
>"cpliu" <spamfreeliu.RemoveThis@yahoo.com> wrote in message
>news:1177228723.748065.24370@n59g2000hsh.googlegroups.com...
>> On Apr 22, 12:33 am, Dave <d....RemoveThis@d.durbs> wrote:
>>> On 21 Apr 2007 21:10:18 -0700, cpliu <spamfree....RemoveThis@yahoo.com> wrote:
>>>
>>> >I use JPEGCrop to crop JPEG files. It works fine but I am looking for
>>> >a cropping tool that can crop at certain ratio (eg. 4x3) or predefined
>>> >size (eg. 800x600). I've read some posts here but still can't find an
>>> >answer.



Click on the 'Crop Tool' and simply type the width and height
in the windows supplied therefore

Dave
 >> Stay informed about: Lossless JPG crop at set size or proportion? 

cpliu wrote:
> I use JPEGCrop to crop JPEG files. It works fine but I am looking for
> a cropping tool that can crop at certain ratio (eg. 4x3) or predefined
> size (eg. 800x600). I've read some posts here but still can't find an
> answer.

There definitely is a lossless JPEG standard, but I've never looked for
it in CS*. Max size will probably suffice.

I am not sure you really mean to crop, which would remove content.
Perhaps you just mean to certain sizes.

For that in CS, go to File - Automate - Fit Image and type in the
dimensions. Batch it and be happy.

If you have CS2 you might look to File - Automate (or Scripts) - Image
Processor.
 >> Stay informed about: Lossless JPG crop at set size or proportion? 

In article <b8om231s7cjkren4p942l0frn587vueruj.RemoveThis@4ax.com>,
Dave <d.RemoveThis@d.durbs> wrote:

> Click on the 'Crop Tool' and simply type the width and height
> in the windows supplied therefore

That's not what he's looking for.

"Lossless JPEG cropping" is a procedure where a JPEG file is cropped to
a set size without being opened and re-saved. The JPEG image is cropped
without introducing further loss.

Photoshop can not do this. Any Photoshop operation on a JPEG involves
uncompressing and then re-compressing it, resulting in cumulative loss.

--
Photography, kink, polyamory, shareware, and more: all at
http://www.xeromag.com/franklin.html
 >> Stay informed about: Lossless JPG crop at set size or proportion? 

On Sun, 22 Apr 2007 20:55:43 -0400, tacit <tacitr.RemoveThis@aol.com> wrote:

>In article <b8om231s7cjkren4p942l0frn587vueruj.RemoveThis@4ax.com>,
> Dave <d.RemoveThis@d.durbs> wrote:
>
>> Click on the 'Crop Tool' and simply type the width and height
>> in the windows supplied therefore
>
>That's not what he's looking for.
>
>"Lossless JPEG cropping" is a procedure where a JPEG file is cropped to
>a set size without being opened and re-saved. T


Keep in mind that the word 'Lossless' whas only mentioned
in the 2nd posting wich was the reply on my post.
What I said was a answer on the question in his first letter.
The question about Loslless Cropping was asked as if it was
a second question.

Dave
 >> Stay informed about: Lossless JPG crop at set size or proportion? 

>
>"Lossless JPEG cropping" is a procedure where a JPEG file is cropped to
>a set size without being opened and re-saved. The JPEG image is cropped
>without introducing further loss.

none the less, thanks for this explanation.

Dave
 >> Stay informed about: Lossless JPG crop at set size or proportion? 

john wrote:

> There definitely is a lossless JPEG standard, but I've never
> looked for it in CS*.

There is and it is poorly supported. However, that is not what happens
with a lossless JPEG crop. Within some constraints (the upper left
corner needs to be aligned to the underlying structure of the JPEG),
lossless cropping of standard JPEGs works just fine.

The programs that support it reuses the compressed blocks from the
original JPEG, thus bypassing any lossy recompressing.

A list of such programs can be found at
http://sylvana.net/jpegcrop/losslessapps.html
They all support the well-known lossless rotation and some of them
support lossless cropping (which strictly speaking is an oxymoron).
--
Toke Eskildsen - http://ekot.dk/
 >> Stay informed about: Lossless JPG crop at set size or proportion? 

On 23 Apr 2007 21:21:12 GMT, Toke Eskildsen <darkwing.RemoveThis@daimi.au.dk>
wrote:

>A list of such programs can be found at
>http://sylvana.net/jpegcrop/losslessapps.html
>They all support the well-known lossless rotation and some of them
>support lossless cropping (which strictly speaking is an oxymoron).

I don't think that "lossless jpeg cropping" is an oxymoron. It's
pretty clear that the ides is that the cropped section *itself* is
lossless - that it contains the same data as in the original with no
data loss introduced thru additional jpeg compression after cropping.

jc

--

"The nice thing about a mare is you get to ride a lot
of different horses without having to own that many."
~ Eileen Morgan of The Mare's Nest, PA
 >> Stay informed about: Lossless JPG crop at set size or proportion?