Skip to main content
news

Re: Lenses and sharpening

Eric Stevens
SubjectRe: Lenses and sharpening
FromEric Stevens
Date09/19/2014 00:14 (09/19/2014 10:14)
Message-ID<qmlm1ahfrpdbqummbsaimpkjka6kussi8j@4ax.com>
Client
Newsgroupsrec.photo.digital
Followsnospam
Followupsnospam (24m) > Eric Stevens

On Thu, 18 Sep 2014 11:52:00 -0400, nospam <nospam@nospam.invalid> wrote:

nospam
In article <87d2atuyp1.fld@barrow.com>, Floyd L. Davidson <floyd@apaflo.com>wrote:

Eric Stevens
If you want to argue with what he said then you have to use the same meaning that he did.

nospam
i used the common meaning of the term reversible.

Floyd L. Davidson
Look up the common meaning of the term "reversible process", and stop making absurd claims. Your problem is not knowing what we are talking about, even now after all this discussion and effort to explain it.

nospam
i didn't say reversible process. you are twisting what i said as well as lying.

i said usm is reversible with a non-destructive workflow.

that is a true statement, and not limited to just usm. again, that's the whole point of a non-destructive workflow.

Floyd L. Davidson
And off we go again with you using a different definition just to confuse the issue.

The discussion is about how a high pass sharpen algorithm is a "reversible process" and an unsharp mask algorithm is not.

nospam
no, the discussion is whether the user can reverse an operation.

This discussion started when in response to Kevin McMurtrie Floyd wrote in Message-ID: <87bnqh1mby.fld@barrow.com>

">The digital form of unsharp mask is the inverse of a blur.

There's both a frequency (diameter) and an intensity.

Not the case. It is the high pass sharpen tool that is the inverse of blur. They can use the exact same algorithm with different parameters. Using one and then the other virtually reverses the results.

UnSharpMask is not reversible."

You completely failed to understand what Floyd was talking about and have added your inestimable contributions ever since.

users do not care about the individual steps that are done internally.

Some users do, especially if it limits what they can do.

your problem is you can't admit that you have no idea about how a non-destructive workflow actually works, so you pretend you do and toss out some buzzwords like non-linear undo (which is laughably wrong) and then try to claim it's only for cartoon characters.

you clearly spewing and also looking like an utter fool.

Floyd L. Davidson
I am well aware of what a non-destructive workflow is and does, and that is why I'm not doing something as stupid as relating it to a non-reversible process such as the unsharp mask function.

nospam
based on what you've said about it, you do not know much about it at all.

you keep saying things that are flat out wrong.

Such as ... ?

Floyd L. Davidson
You do not seem to be able to differentiate the terminology required to discuss the topic at hand. Apparently "Abobe for Dummies" doesn't have even one paragraph, much less the necessary chapter, to help you with that.

nospam
adobe, not abobe.

you can't even get that right, and don't try to blame it on it being a typo since the b and d keys are not next to each other and you've said abobe on more than one occasion.

in any event, your insistence that a non-destructive workflow is for dummies (and in another post, for cartoon characters) is additional proof that you know very little about it.

That's not quite what he said, either.

the majority of professional photographers use a non-destructive workflow, namely lightroom, and they sure as hell aren't 'dummies'.

he is using his own narrow definition and intentionally dismissing *anything* else.

Floyd L. Davidson
Because a typical dictionary may have 14 meanings for a word is not a license for a reader to choose which one to abuse. The *writer* chooses, not the reader.

nospam
it seems you cannot discern between reading and writing.

*i'm* the one who said usm is reversible in a non-destructive workflow, which makes *me* the writer. therefore, according to you, i get to choose.

Floyd L. Davidson
Kind makes you look less than astute. You did write that... after you *read* a reference to "non-reversible functions". If you want to respond to that you do not have the option of redefining the terms.

nospam
i'm not redefining anything.

not that i need to choose, since they all apply: <http://www.merriam-webster.com/dictionary/reversible> : able to be changed back to an earlier or original state

yes.

: able to be stopped and not causing permanent damage or changes

yes

: having two sides that can be used

if you consider raw and finished to be sides, then this works too.

definitely 2 out of 3 and arguably 3 out of 3.

it's reversible.

Floyd L. Davidson
Now look up what a "reversible process" is. The term of art, not the simple term.

nospam
look up non-destructive workflow and try to learn something for a change.

Stick with the subject and look up what a "reversible process" is. --

Regards,

Eric Stevens