A LATE 1800's - EARLY 1900'S PRINT ON GLASS?

Peter Chant wrote:

Krita and the GIMP both think they are greyscale on linux.

Thanks for the feedback, Peter. I was starting to think that I was going
crazy. I guess I'm not!

Mardon wrote:
John McWilliams wrote:

They look fine on this (laptop) Mac.

But: they are RGB! Now, each channel has exactly the same histogram as
the others, but somewhere it got put into RGB.

If it has a color cast, that suggests the monitor is a tad off.... it
looks completely grayscale here, but it most certainly has three color
channels, however lacking in saturation!

The 3 thumbnails at http://www.justphotos.ca/misc/cnp/ are RGB but the
images that are linked to the thumbnails are definitely grayscale with an
embedded grayscale profile. I just double-checked. Why do you say they
are RGB?

My observation was of the first one you linked to that I saw:

http://www.justphotos.ca/misc/images/Cnp0720.jpg

Definitely RGB- do you recall at what level you saved this? (I ask
because on resaving at level 10, the image size increases several fold.)

The images linked to above are indeed greyscale, and seem to be the same
file number with "-1" appended.

--
John McWilliams

Mardon wrote:
Peter Chant wrote:

Krita and the GIMP both think they are greyscale on linux.

Thanks for the feedback, Peter. I was starting to think that I was going
crazy. I guess I'm not!

No one (but you, maybe!) thought that. See my reply upstream; there are
two sets of images, greyscale ones with -1 appended, and RGB ones
without it.

--
John McWilliams

John McWilliams wrote:

My observation was of the first one you linked to that I saw:

http://www.justphotos.ca/misc/images/Cnp0720.jpg

Definitely RGB- do you recall at what level you saved this? (I ask
because on resaving at level 10, the image size increases several fold.)

The images linked to above are indeed greyscale, and seem to be the same
file number with "-1" appended.

Thank you for the reply. It was confusion on my part. I agree that the
'unframed' image posted at http://www.justphotos.ca/misc/images/Cnp0720.jpg
is RGB. I images that I was saying were grayscale are the three images
linked to the thumbnails at http://www.justphotos.ca/misc/cnp/ It seems we
are agreed that those are grayscale. Great!

I don't remember the compression level for any of them. I usually use 6 to
8 depending on how big the file gets. I target around 200 KB for most
things that I post.

Thanks again.

Mardon wrote:
Colin_D wrote:

Something's wrong with the link, then. Both your images are definitely
RGB. I opened them in Photoshop, and the Mode said RGB for both
Further, the first image unpacked size is 14.2 MB, and on converting to
grayscale in PS the size dropped to 4.74 MB, likewise the second image,
from 9.18 MB to 3.06 MB.

Colin D.

Hi,

I'm totally puzzled. I'd really like to understand what is going on that
causes people to see these images as RGB. I just ftp'd the 3 images in
question from the server back to my PC. These images a

http://www.justphotos.ca/misc/cnp/im...038CloseUp.jpg
http://www.justphotos.ca/misc/cnp/images/Cnp1514.jpg
http://www.justphotos.ca/misc/cnp/images/Falls1924.jpg

I then looked at them using Adobe Bridge CS3 and opened them in PS CS3.
The file specs from Bridge are shown below. PS CS3 shows the "Mode" as
"grayscale". I'm at a loss as to why they are appearing to be RGB to
others. Any thoughts?

Filename Cnp1038CloseUp.jpg
File Size 195 KB
Dimensions 1100 x 734
Resolution 72 dpi
Color Mode B&W
Color Profile Gray Gamma 2.2

Filename Cnp1514.jpg
File Size 164 KB
Dimensions 1100 x 787
Resolution 72 dpi
Color Mode B&W
Color Profile Gray Gamma 2.2

Filename Cnp1924.jpg
File Size 218 KB
Dimensions 1100 x 7377
Resolution 72 dpi
Color Mode B&W
Color Profile Gray Gamma 2.2

The plot thickens, as they say. Those three images are grayscale. I
just re-opened the previous two images, and they are definitely RGB.

Hair-pulling time?

Colin D.

--
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Colin_D wrote:

The plot thickens, as they say. Those three images are grayscale. I
just re-opened the previous two images, and they are definitely RGB.
Hair-pulling time?
Colin D.

Thanks. It was me that created the confusion. I agree that the image
referred to in the OP was RGB. It was only these the three 'framed' images
that I was calling grayscale. Sorry for having messed this up. Mystery
solved!

Mardon wrote:
Colin_D wrote:

The plot thickens, as they say. Those three images are grayscale. I
just re-opened the previous two images, and they are definitely RGB.
Hair-pulling time?
Colin D.

Thanks. It was me that created the confusion. I agree that the image
referred to in the OP was RGB. It was only these the three 'framed' images
that I was calling grayscale. Sorry for having messed this up. Mystery
solved!
Great. Much better to have an answer than be left in the dark.

Colin D.

--
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