Google| Subject | Re: Lenses and sharpening |
| From | Eric Stevens |
| Date | 09/20/2014 02:40 (09/20/2014 12:40) |
| Message-ID | <dlip1atj87lout9dl7fl5eje2uaddfdril@4ax.com> |
| Client | |
| Newsgroups | rec.photo.digital |
| Follows | Sandman |
| Followups | nospam (2m) > Eric Stevens Sandman (7h & 20m) > Eric Stevens |
On 19 Sep 2014 06:52:11 GMT, Sandman <mr@sandman.net>wrote:
SandmanWhen I (and Floyd) say 'fully reversible' we are using a very specific meaning.
In article <ld4n1a1cmj32ak5ua8fl5s515112u8ljh7@4ax.com>, Eric Stevens wrote:SandmannospamEric Stevens
which means the changes are reversible.
You are not reversing the changes: you are substituting for them.
Removing an effect reverses it 100%. No substitution involved. You are confused.
For example, saving an image as a JPG is not fully reversible in that you cannot reconstruct the exact original image from the JPG. There will be differences which can be corrected only if you bring in additional (pixel) information from outside the reconstructed image.
Image 1 --->JPG --->Image 2 is not a fully reversible process. Image 1 cannot = Image 2.
I don't want to continue to wander down yet another of nospam's side paths, but I was pointing out that changing an edit before a file is exported isn't actually changing anything in the final exported image, so you can't claim to have reversed anything in the image. --Sandmannospam
not only do i realize it but that's what i've been saying all along.you are *so* confused.Eric Stevens
And I have pointed out that you cannot reverse a change which has not actually been made. Even if it is reversible, you can't reverse something before you have done it.
No one has talked about reversing things you haven't done. We've been discussing Lightroom, where you can reverse everything you have done.
Regards,
Eric Stevens
09/13/2014-
