VoyForums

[ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: [1], 2, 3, 4, 5, 6, 7, 8, 9, 10 ]

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Date Posted: 06:48:43 04/12/04 Mon
Author: Michel
Subject: Re: Lossless rotations
In reply to: Mike Crapo 's message, "Re: Lossless rotations" on 12:33:38 04/01/04 Thu


Hi,

I think JPEG2000 has a lossless mode but I have not tried it. The advantage of JPG is that it is lossy and can achieve much higher compression rates.

Best regards,

Michel

>Hert.
>
>I do not believe that there is a lossless format for
>Jpeg. The standard that is out there that can
>compress almost as good as a jpeg but is lossless is
>png. Michael's library does support this. From my
>observations, png is a good format, but takes more
>horsepower and time to compress than Jpeg.
>
>
>Mike
>
>>Hello Michel,
>>
>>That is why some software product offer Lossless
>>manipulation. A little surfing over the web learned me
>>that there is a separate standard for lossless JPG.
>>That made me wonder if you were considering adding
>>lossless to your great library.
>>
>>Kind regards,
>>
>>Hert
>>
>>
>>>
>>>Hi Hert,
>>>
>>>The rotation itself is not lossy, but everytime you
>>>save a JPG you will lose quality. I recommend only
>>>saving to JPG after manipulations are done. As far as
>>>I know, the compress factor is only used when saving.
>>>Once an image is saved, it is then loaded "as is",
>>>independent of the original compression factor.
>>>
>>>Best regards,
>>>
>>>Michel
>>>
>>>>My customers ask me if I can implement a lossless
>JPG
>>>>rotation method. Is this possible, and if so how?
>>>>
>>>>I did not find any way of reading the current
>>>>compression factor, because it always defaults to
>80.

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Replies:

[ Contact Forum Admin ]

Forum timezone: GMT-5
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.