Discussion:
gray scale photos
(too old to reply)
Linea Recta
2004-02-22 19:17:33 UTC
Permalink
What's the best way to scan gray scale photo's for archiving? Gray scale or
colour? I believe gray has only 255 shades?
--
regards,

|\ /|
| \/ |@rk
\../
\/os
Tom Thackrey
2004-02-22 20:26:20 UTC
Permalink
Post by Linea Recta
What's the best way to scan gray scale photo's for archiving? Gray scale or
colour? I believe gray has only 255 shades?
8 bit RGB only had 256 shades of gray and grayscale is 1/3 the size.
--
Tom Thackrey
www.creative-light.com
tom (at) creative (dash) light (dot) com
do NOT send email to ***@willglen.net (it's reserved for spammers)
Uni
2004-02-22 20:53:41 UTC
Permalink
Post by Tom Thackrey
Post by Linea Recta
What's the best way to scan gray scale photo's for archiving? Gray scale or
colour? I believe gray has only 255 shades?
8 bit RGB only had 256 shades of gray and grayscale is 1/3 the size.
That's what you get when you use an 8-bit editor, such as Paint Shop Pro.

Uni
Xalinai
2004-02-22 21:24:39 UTC
Permalink
Post by Linea Recta
What's the best way to scan gray scale photo's for archiving? Gray scale or
colour? I believe gray has only 255 shades?
That depends on your purpose.

If you want to represent the image contents only, you scan it in
greyscale, optimize the distribution of the greylevels (black and
white points, distribution curve) in the scanning software and save
the result as lossless compressed eight bit PNG.

If you want to save artistic effects or the condition of the image the
day when you decided to stop aging and decay, you should scan it as
color image - following all rules for archiving color images.

Michael
Linea Recta
2004-02-23 19:11:25 UTC
Permalink
Post by Xalinai
Post by Linea Recta
What's the best way to scan gray scale photo's for archiving? Gray scale or
colour? I believe gray has only 255 shades?
That depends on your purpose.
If you want to represent the image contents only, you scan it in
greyscale, optimize the distribution of the greylevels (black and
white points, distribution curve) in the scanning software and save
the result as lossless compressed eight bit PNG.
If you want to save artistic effects or the condition of the image the
day when you decided to stop aging and decay, you should scan it as
color image - following all rules for archiving color images.
It would be ideal to recreate the (old) images the way they looked 80 years
ago. I'll investigate into all the processing later, but I start my work by
scanning....... in colour mode!
--
regards,

|\ /|
| \/ |@rk
\../
\/os
A Soberon
2004-02-23 00:08:54 UTC
Permalink
Look in here:

http://www.scantips.com/
Linea Recta
2004-02-23 19:12:47 UTC
Permalink
Yes, nice site, but I couldn't quite find an answer to my specific question.
--
regards,

|\ /|
| \/ |@rk
\../
\/os
Post by A Soberon
http://www.scantips.com/
A Soberon
2004-02-23 19:16:51 UTC
Permalink
Post by Linea Recta
Yes, nice site, but I couldn't quite find an answer to my specific question.
Fuera de tema, acaso hablas español? Por lo de "Linea Recta"

Saludos

Antonio
Linea Recta
2004-02-23 19:39:54 UTC
Permalink
I'm afraid I 'only' speak Dutch, English, French, German and Latin...
--
regards,

|\ /|
| \/ |@rk
\../
\/os
Post by Linea Recta
Post by Linea Recta
Yes, nice site, but I couldn't quite find an answer to my specific
question.
Fuera de tema, acaso hablas español? Por lo de "Linea Recta"
Saludos
Antonio
A Soberon
2004-02-23 22:48:50 UTC
Permalink
Post by Linea Recta
I'm afraid I 'only' speak Dutch, English, French, German and Latin...
Afraid of what??

Wonder why the "Linea Recta" nickname, but anyway, welcome to the NG.

Antonio
Linea Recta
2004-02-24 14:54:55 UTC
Permalink
Post by A Soberon
Post by Linea Recta
I'm afraid I 'only' speak Dutch, English, French, German and Latin...
Afraid of what??
Wonder why the "Linea Recta" nickname, but anyway, welcome to the NG.
It's Latin for straight (line). Straightforward way of reasoning as opposed
to twisted.
--
Welcome too :-)



|\ /|
| \/ |@rk
\../
\/os
Artin Mikaelyan
2004-02-23 09:05:05 UTC
Permalink
IMHO:

I red this tip somewhere:
For best result of convwerting color to B/W or grayscale first scan like
normal color RGB. Then convert it in LAB color model. After this just delete
channels "a" and "b" - you need only channel "L" for true Grayscale image!

I tried this and this give me better results than automate "convert to
grayscale" option...

Good luck!
Linea Recta
2004-02-23 19:14:29 UTC
Permalink
Right, I'll start scanning al b&W's in colour, (and also the colour
photo's).
--
regards,

|\ /|
| \/ |@rk
\../
\/os
Post by Artin Mikaelyan
For best result of convwerting color to B/W or grayscale first scan like
normal color RGB. Then convert it in LAB color model. After this just delete
channels "a" and "b" - you need only channel "L" for true Grayscale image!
I tried this and this give me better results than automate "convert to
grayscale" option...
Good luck!
Mendel Leisk
2004-02-27 01:21:28 UTC
Permalink
Post by Artin Mikaelyan
Post by Artin Mikaelyan
For best result of convwerting color to B/W or grayscale first scan like
normal color RGB. Then convert it in LAB color model. After this just
delete
Post by Artin Mikaelyan
channels "a" and "b" - you need only channel "L" for true Grayscale image!
I tried this and this give me better results than automate "convert to
grayscale" option...
Good luck!
I found these lab conversions lost shadow detail.

Mendel Leisk
2004-02-25 02:41:12 UTC
Permalink
Post by Linea Recta
What's the best way to scan gray scale photo's for archiving? Gray scale or
colour? I believe gray has only 255 shades?
For me: Vuescan raw files, in 48 bit rgb.
Continue reading on narkive:
Loading...