PainShop Pro Graphics - Ron V - Histogram question

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Ron V - Histogram question

Nightingail

2005-05-15, 4:19 am

I often use the histogram tool to set basic clip limits when I
start working on a photo, then find it useful to use it again
towards the middle or end (after making various other
modifications using different tools) in order to refine aspects
of the image to my personal taste. I always save the original as
is, and make modifications to saved PSP versions, so is there any
reason I shouldn't be using the Histogram more than once per
image?

Thanks,
Gail

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RonaldV

2005-05-15, 7:31 pm

On Sun, 15 May 2005 01:35:57 -0400, "Nightingail" <gail@nospam.com>
wrote:

>
> I often use the histogram tool to set basic clip limits when I
>start working on a photo, then find it useful to use it again
>towards the middle or end (after making various other
>modifications using different tools) in order to refine aspects
>of the image to my personal taste. I always save the original as
>is, and make modifications to saved PSP versions, so is there any
>reason I shouldn't be using the Histogram more than once per
>image?
>
>Thanks,
>Gail

Actually, if you plan on making a luminance and color adjustment,
you'll have to use it at least twice.

However, it's not a tool that doesn't change the image you edit. For
example, if you drive a lot of luminance into cutoff, there's no way
you can bring those back out of the luminance level were they were
set.

Now the same thing happens when you use Gamma adjust, Levels that are
merged as a result of the operation will not 'Split out' if you try
to expand them.

This isn't to say that you shouldn't use multiple applications of the
histogram adjust, just be aware of the possible effects. It's a
great tool, but it can get wild & hairy if you're not careful.

Nightingail

2005-05-16, 4:24 am

Thank you, Ron, that clears up some things I'd been confused
about. If we end up getting a histogram adjustment layer,
wouldn't that eliminate the problem of irreversible adverse
effects? Or am I still confused?

Gail

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http://www.nightingail.com

"RonaldV" <ron_vick@bellsouth.net> wrote in message
news:jspe811hard2sikua7keqhqlebtcpfn475@4ax.com...
> Actually, if you plan on making a luminance and color
adjustment,
> you'll have to use it at least twice.
>
> However, it's not a tool that doesn't change the image you
edit. For
> example, if you drive a lot of luminance into cutoff, there's
no way
> you can bring those back out of the luminance level were they
were
> set.
>
> Now the same thing happens when you use Gamma adjust, Levels
that are
> merged as a result of the operation will not 'Split out' if
you try
> to expand them.
>
> This isn't to say that you shouldn't use multiple applications
of the
> histogram adjust, just be aware of the possible effects. It's
a
> great tool, but it can get wild & hairy if you're not careful.
>
>
>

RonaldV

2005-05-16, 7:42 pm

On Mon, 16 May 2005 02:17:03 -0400, "Nightingail" <gail@nospam.com>
wrote:

>
>Thank you, Ron, that clears up some things I'd been confused
>about. If we end up getting a histogram adjustment layer,
>wouldn't that eliminate the problem of irreversible adverse
>effects? Or am I still confused?
>
>Gail

No, but in the meantime, use a Curve adjustment layer. Once you see
how the histogram and Curve are related, you'll come very close.

RonV
Tangling with the Python

Nightingail

2005-05-17, 4:22 am

Yep, I'm getting more comfortable using curves ;-) Thanks again,
Ron.

Gail

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"RonaldV" <RonVick@cfl.rr.com> wrote in message
news:q52h81l2m1al8pmltitu50qfl6m5rlqg3u@4ax.com...
>
> No, but in the meantime, use a Curve adjustment layer. Once
you see
> how the histogram and Curve are related, you'll come very
close.
>
>
> RonV
> Tangling with the Python
>