XY coordinate values

[James J. Roper]

I capture an image that is a scatterplot and I wish to repeat (check) the
analysis.  I would like to scale both ordinate and abcissa and then select
the points in the scatterplot to create a data base with the same values as
the original figure.  Is that possible?  I might be dumb, but I have looked
and can't find what I want.  I did get XY coordinates, but they were not in
the original scale.  Please - any suggestions?

Jim

[Gwen Barnes]

I recommend Data Thief:

http://www.datathief.org/

-Gwen

On 3/16/08, James Joseph Roper <[hidden email]> wrote:

>
> I capture an image that is a scatterplot and I wish to repeat (check) the
> analysis.  I would like to scale both ordinate and abcissa and then select
> the points in the scatterplot to create a data base with the same values
> as
> the original figure.  Is that possible?  I might be dumb, but I have
> looked
> and can't find what I want.  I did get XY coordinates, but they were not
> in
> the original scale.  Please - any suggestions?
>
> Jim
>

[David Hovis]

On Mar 16, 2008, at 3:54 PM, James Joseph Roper wrote:

> I capture an image that is a scatterplot and I wish to repeat  
> (check) the
> analysis.  I would like to scale both ordinate and abcissa and then  
> select
> the points in the scatterplot to create a data base with the same  
> values as
> the original figure.  Is that possible?  I might be dumb, but I have  
> looked
> and can't find what I want.  I did get XY coordinates, but they were  
> not in
> the original scale.  Please - any suggestions?
>
> Jim

I've toyed with the idea of writing an ImageJ plugin to do exactly  
what you're suggesting.  It would not be very hard.  I've never gotten  
around to it, though.

Right now I measure the origin in ImageJ, and measure one point on the  
x-axis and one on the y-axis.  Then I take the data into Excel and  
determine a conversion function for the x and y axes.  Then I measure  
all the points in ImageJ's coordinate space and convert them to the  
real data in Excel.

--David

[Jim Quinn-2]

Folks -

CCP14 has a good list of programs to digitize
hardcopy graphs to data.

http://www.ccp14.ac.uk/solution/hardcopy2data.htm

JQuinn


 > From [hidden email]  Sun Mar 16 15:02:57 2008
 > Date:         Sun, 16 Mar 2008 15:54:32 -0400
 > Reply-To: ImageJ Interest Group <[hidden email]>
 > Sender: ImageJ Interest Group <[hidden email]>
 > From: James Joseph Roper <[hidden email]>
 > Subject: XY coordinate values
 > To: [hidden email]
 >
 > I capture an image that is a scatterplot and I wish to repeat (check) the
 > analysis.  I would like to scale both ordinate and abcissa and then select
 > the points in the scatterplot to create a data base with the same value as
 > the original figure.  Is that possible?  I might be dumb, but I have looked
 > and can't find what I want.  I did get XY coordinates, but they were not in
 > the original scale.  Please - any suggestions?
 >
 > Jim
 >