Extacting Greyscale Values from Sections of an Image

Hi,

A friend of mine is working on a project for a painting course and came to me in the hopes that the current phase of it could be automated in Photoshop. Basically, she has a greyscale picture over which she draws a black grid with each square about an inch on a side.

After drawing the grid, she goes through each square and determines,

a rough estimate, the "level" of greyscale contained in the underlying picture for that particular square. Basically, a completely white grid

is considered having a value 0, black has value 10. Intermediate shades

grey would fall in between these bounds. Check out
http://members.cox.net/~m_masi/example.jpg for an example of what I mean.
So the question is, can this process be automated in Photoshop? Creating the grid doesn’t seem to be a problem, it’s getting the program to process each individual square and produce an arbitrary greyscale value.
I’m wondering if there exists a plugin that can provide this

Does the software have scripting capabilities that could allow me to accomplish this? Eventually, I’d like to have it so she could load any greyscale image, run a plugin/script/etc and get a text file with a bunch

numbers corresponding to the greyscale grid values. Maybe I’m asking for more than what this progam can offer, but I would appreciate any insights! Thanks in advance.

Mike

Hi,

A friend of mine is working on a project for a painting course and came to me in the hopes that the current phase of it could be automated in Photoshop. Basically, she has a greyscale picture over which she draws a black grid with each square about an inch on a side.

After drawing the grid, she goes through each square and determines, through a rough estimate, the "level" of greyscale contained in the underlying picture for that particular square.

So the question is, can this process be automated in Photoshop? Creating the grid doesn’t seem to be a problem, it’s getting the program to process each individual square and produce an arbitrary greyscale value.

Hi,

A friend of mine is working on a project for a painting course and came to me in the hopes that the current phase of it could be automated in Photoshop. Basically, she has a greyscale picture over which she draws a black grid with each square about an inch on a side.

After drawing the grid, she goes through each square and determines,

a rough estimate, the "level" of greyscale contained in the underlying picture for that particular square. Basically, a completely white grid

is considered having a value 0, black has value 10. Intermediate shades

grey would fall in between these bounds. Check out
http://members.cox.net/~m_masi/example.jpg for an example of what I mean.
So the question is, can this process be automated in Photoshop? Creating the grid doesn’t seem to be a problem, it’s getting the program to process each individual square and produce an arbitrary greyscale value.
I’m wondering if there exists a plugin that can provide this

Does the software have scripting capabilities that could allow me to accomplish this? Eventually, I’d like to have it so she could load any greyscale image, run a plugin/script/etc and get a text file with a bunch

numbers corresponding to the greyscale grid values. Maybe I’m asking for more than what this progam can offer, but I would appreciate any insights! Thanks in advance.

Mike

if you are going to a printing press the lightest shade on the picture has to be at least 10% grey you can use the curves adjustment to set the white scale to 10% and youll also want the blackest point at 90%. .

"Mike" wrote in message

Hi,

A friend of mine is working on a project for a painting course and came to me in the hopes that the current phase of it could be automated in Photoshop. Basically, she has a greyscale picture over which she draws a black grid with each square about an inch on a side.

After drawing the grid, she goes through each square and determines,

through

a rough estimate, the "level" of greyscale contained in the underlying picture for that particular square. Basically, a completely white grid

area

is considered having a value 0, black has value 10. Intermediate shades

of

grey would fall in between these bounds. Check out
http://members.cox.net/~m_masi/example.jpg for an example of what I mean.
So the question is, can this process be automated in Photoshop? Creating the grid doesn’t seem to be a problem, it’s getting the program to process each individual square and produce an arbitrary greyscale value.
I’m wondering if there exists a plugin that can provide this

functionality.

Does the software have scripting capabilities that could allow me to accomplish this? Eventually, I’d like to have it so she could load any greyscale image, run a plugin/script/etc and get a text file with a bunch

of

numbers corresponding to the greyscale grid values. Maybe I’m asking for more than what this progam can offer, but I would appreciate any insights! Thanks in advance.

Mike

open the info window and use the eye dropper tool switch the info window to cmyk and as you move the dropper tool around on the picture it will tell you the amount of gray on a scale of 1-100
if you are going to a printing press the lightest shade on the picture has to be at least 10% grey

scale to 10% and youll also want the blackest point at 90%. . "Mike" wrote in message

Hi,

A friend of mine is working on a project for a painting course and came to me in the hopes that the current phase of it could be automated in Photoshop. Basically, she has a greyscale picture over which she draws a black grid with each square about an inch on a side.

After drawing the grid, she goes through each square and determines,

through

a rough estimate, the "level" of greyscale contained in the underlying picture for that particular square. Basically, a completely white grid

area

is considered having a value 0, black has value 10. Intermediate shades

of

grey would fall in between these bounds. Check out
http://members.cox.net/~m_masi/example.jpg for an example of what I mean.
So the question is, can this process be automated in Photoshop? Creating the grid doesn’t seem to be a problem, it’s getting the program to process each individual square and produce an arbitrary greyscale value.
I’m wondering if there exists a plugin that can provide this

functionality.

Does the software have scripting capabilities that could allow me to accomplish this? Eventually, I’d like to have it so she could load any greyscale image, run a plugin/script/etc and get a text file with a bunch

of

numbers corresponding to the greyscale grid values. Maybe I’m asking for more than what this progam can offer, but I would appreciate any insights! Thanks in advance.

Mike

Hi,

A friend of mine is working on a project for a painting course and came to me in the hopes that the current phase of it could be automated in Photoshop. Basically, she has a greyscale picture over which she draws a black grid with each square about an inch on a side.

After drawing the grid, she goes through each square and determines, through a rough estimate, the "level" of greyscale contained in the underlying picture for that particular square. Basically, a completely white grid area is considered having a value 0, black has value 10. Intermediate shades of grey would fall in between these bounds. Check out
http://members.cox.net/~m_masi/example.jpg for an example of what I mean.
So the question is, can this process be automated in Photoshop? Creating the grid doesn’t seem to be a problem, it’s getting the program to process each individual square and produce an arbitrary greyscale value.
I’m wondering if there exists a plugin that can provide this functionality. Does the software have scripting capabilities that could allow me to accomplish this? Eventually, I’d like to have it so she could load any greyscale image, run a plugin/script/etc and get a text file with a bunch of numbers corresponding to the greyscale grid values. Maybe I’m asking for more than what this progam can offer, but I would appreciate any insights! Thanks in advance.

Mike

ben-dover wrote:

open the info window and use the eye dropper tool switch the info window to cmyk and as you move the dropper tool around on the picture it will tell you the amount of gray on a scale of 1-100 if you are going to a printing press the lightest shade on the picture has to be at least 10% grey

Why is this? So they can outline it, if it has a lot of pure white?