Johan Vromans schrieb:
> it is just like the GIMP: it reads (hence decompresses) the image
> and recompresses it when saving.
>
> For lossless manipulation, use jpegtran and jhead. Of course,
> cropping, flipping and rotating by right angles only.
>
And mapivi does it with GUI on Linux.
http://
David Hodson writes:
> > For Linux, there's of course the command line based
> > ImageMagick (http://www.imagemagick.org/). You can do
> > really amazing stuff with it (see at http://www.imagemagick.org/Usage/).
>
> But it doesn't do lossless jpeg processing!
No, it is just like the GIMP: it r
On Tue, 2009-02-03 at 15:34 +0100, Claus Cyrny wrote:
> Gary Collins wrote:
>
> > Hello. I read from an article which says jpeg images can be cropped
> > losslessly. I searched "lossless gimp crop" on google without good
> > findings. Can gimp do lossless cropping? If not, what softwar
Gary Collins wrote:
> Hello. I read from an article which says jpeg images can be cropped
> losslessly. I searched "lossless gimp crop" on google without good
> findings. Can gimp do lossless cropping? If not, what software (better
> has an GUI because I am not commandline guru) on
e: Sun, 01 Feb 2009 19:46:10 +0800
From: zhangwe...@realss.com
Subject: [Gimp-user] lossless cropping?
To: gimp-user
Message-ID: <49858b82.7020...@realss.com>
Content-Type: text/plain; charset=UTF-8
Hello. I read from an article which says jpeg images can be cropped
losslessly. I searched
>On Mon, Feb 02, 2009 at 01:37:24PM +0100, Claus Cyrny wrote:
>>
>> I have to admit that, after following this thread, I still
>> have no idea what Zhang Wei Wu means by 'lossless 'cropping'.
>> I understand' lossless compression', but cropping is by definition
>> lossy (you remove part of the ori
Hi,
On 02 Feb 09 12:44 Alexander Rabtchevich
said:
> I guess lossless means the remained part ot the image hasn't been
> re-encoded (it has the same jpg data as the original image).
That was what I understood when I made my initial reply. Hence I
described the workings of a "jpeg file editor"
On Mon, Feb 02, 2009 at 01:37:24PM +0100, Claus Cyrny wrote:
>
> I have to admit that, after following this thread, I still
> have no idea what Zhang Wei Wu means by 'lossless 'cropping'.
> I understand' lossless compression', but cropping is by definition
> lossy (you remove part of the original
I guess lossless means the remained part ot the image hasn't been
re-encoded (it has the same jpg data as the original image).
Claus Cyrny wrote:
> I have to admit that, after following this thread, I still
> have no idea what Zhang Wei Wu means by 'lossless 'cropping'.
> I understand' lossless c
Greg Chapman wrote:
> Hi Alexander,
>
> On 02 Feb 09 09:26 Alexander Rabtchevich
> said:
>> I think you mix cropping and resizing :).
>
> I didn't mix them. I just assumed Johan had. Up till now this thread
> had been exclusively about cropping.
I have to admit that, after following this thre
>
>Lossless resizing? How do you envision that?
>
>-- Johan
>
while I have heard about possible plans about how to do lossless resizing
from one of the JPEG guys, it would require extension of the standard and it
would only be able to resize to 1/8, 2/8, 3/8, ... of the original size.
It does not
Hi Alexander,
On 02 Feb 09 09:26 Alexander Rabtchevich
said:
> I think you mix cropping and resizing :).
I didn't mix them. I just assumed Johan had. Up till now this thread
had been exclusively about cropping.
Greg Chapman
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I think you mix cropping and resizing :).
Greg Chapman wrote:
> Hi,
>
> On 02 Feb 09 08:24 Johan Vromans said:
>
>> Lossless resizing? How do you envision that?
>>
>
> 1. Read the file
> 2. Separate image segment from, Comment, EXIF, IPTC, and other data
> segments
> 3. Delete just thos
Hi,
On 02 Feb 09 08:24 Johan Vromans said:
>
> Lossless resizing? How do you envision that?
1. Read the file
2. Separate image segment from, Comment, EXIF, IPTC, and other data
segments
3. Delete just those bytes that refer to the unwanted parts of the
image
4. Reassemble the file, with any r
zhangwe...@realss.com writes:
> Can any recommend such an editor for lossless cropping & rotating,
> better even lossless resizing,
Lossless resizing? How do you envision that?
-- Johan
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Gimp-user@lists.XCF.Berkeley.EDU
https:
zhangwe...@realss.com schrieb:
> what software (better has an GUI because I am not commandline guru) on Linux
> can be used to do
> lossless cropping?
>
A more complete answer to myself in case anyone needs it too:
Tools on Linux that can do loseless cropping:
Commandline tool:
jpegcrop
zhangwe...@realss.com schrieb:
> Can any recommend such an editor for lossless cropping & rotating,
>
>
With the following googles that have corrected my stupid typos now I can
get some information about lossless cropping and answer my own question:
http://sylvana.net/jpegcrop/ offer commandlin
Sven Neumann schrieb:
> GIMP doesn't know anything about JPEG images. The image is opened by a
> plug-in and the core only gets to see the decompressed image. So if you
> crop the image in GIMP, it will have to be recompressed when it is saved
> as JPEG again. The JPEG plug-in does a nice job at pr
Sven Neumann schrieb:
> Hi,
>
> On Sun, 2009-02-01 at 19:46 +0800, zhangwe...@realss.com wrote:
>
>> Hello. I read from an article which says jpeg images can be cropped
>> losslessly. I searched "lossless gimp crop" on google without good
>> findings. Can gimp do lossless cropping?
>>
>
> G
Hi,
On Sun, 2009-02-01 at 19:46 +0800, zhangwe...@realss.com wrote:
> Hello. I read from an article which says jpeg images can be cropped
> losslessly. I searched "lossless gimp crop" on google without good
> findings. Can gimp do lossless cropping?
GIMP doesn't know anything about JPEG images. T
On Sun, 01 Feb 2009 19:46:10 +0800, zhangwe...@realss.com wrote:
> Hello. I read from an article which says jpeg images can be cropped
> losslessly. I searched "lossless gimp crop" on google without good
> findings. Can gimp do lossless cropping? If not, what software (better
> has an GUI because
Hello. I read from an article which says jpeg images can be cropped
losslessly. I searched "lossless gimp crop" on google without good
findings. Can gimp do lossless cropping? If not, what software (better
has an GUI because I am not commandline guru) on Linux can be used to do
lossless cropping?
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