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# Analysing a few .tiff files

Asked by Dominic Lawson on 11 Jul 2012

I have a bunch of .tiff files that are pictures of a diffraction pattern evolving with time. Each file is an array 480x640 where each entry in the array is an intensity value.

I want to load the .tiff files automatically into Matlab and obtain the total intensity for each file by adding each entry together until the total is reached. I want these total values to be remembered and at the end the total intensities are recalled and plotted as intensity vs. time.

I know how to load up an individual .tiff file using the imread function. I have spent a lot of time trying to figure out what commands I need but haven’t gotten far.

Does anyone have any thoughts on my problem please? Any help would be greatly appreciated.

## 2 Comments

Ryan on 11 Jul 2012

How are the .tiff files named? Is it something like Image_namestuff_1.tiff, Image_namestuff_2.tiff... etc?

Dominic Lawson on 11 Jul 2012

Yes that's right

To be precise:-

Run20120629.103217 Multiple Image - 00000

Run20120629.103217 Multiple Image - 00001 etc...

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## 2 Answers

Answer by Steve Eddins on 11 Jul 2012
Accepted answer

Are the different time slices stored in different TIFF files? Then try something like this:

```d = dir('myfiles*.tiff');
total = zeros(480,640);
for k = 1:length(d)
I = imread(d(k).name);
total = total + double(I);
end
```

Or are the different time slices all stored in a single TIFF file? Then try something like this:

```total = zeros(480,640);
info = imfinfo('myfile.tiff');
num_slices = length(info);
for k = 1:num_slices
I = imread('myfile.tiff','Info',info,'Index',k);
total = total + double(I);
end
```

## 5 Comments

Dominic Lawson on 12 Jul 2012

I've come back to MATLAB this morning having had time to relax and gather my thoughts. I can load in my data files using your code above. Thanks very much indeed.

I still want each file to be uploaded and each file to have its entire contents added up and the values stored in a separate array or something. This seems to be partially happening just now but I keep getting a value of 255 for the total of each array. I know their totals should be greater than this.

Any thoughts please?

clear all

t = 0;

d = dir('*.tif');

total = zeros(480,640);

for k = 1:length(d)

`    I = imread(d(k).name);`
`    total = total + double(I);`
`    for i = 1:numel(I)`
`        t = t + I(i);`
`    end`

end

disp(t)

Ryan on 12 Jul 2012

If you're looking for the sum of all of the pixel values in a particular image use this in your loop:

` SumOfPixelValues(k) = sum(sum(I));`
Dominic Lawson on 13 Jul 2012

Thank you very much for your help

Answer by Image Analyst on 11 Jul 2012

## 3 Comments

Dominic Lawson on 12 Jul 2012

Thanks had already looked and tried these example codes but didn't work sadly.

Image Analyst on 12 Jul 2012

Strange. I'll take a look at the FAQ, find the bug in it, and fix the code there. I don't want non-working code in the FAQ.

Dominic Lawson on 12 Jul 2012

Dear Image Analyst,

Here is my code thus far:-

clear all

t = 0;

d = dir('*.tif');

z = [ ];

z = zeros(11,1);

for k = 1:length(d)

`    I = imread(d(k).name); `
`    for i = 1:numel(I)`
`        z(:,1) = t + I(i)`
`    end`

end

I want to have each file loaded in, the array elements all added together, this value stored then move onto the next file. When all files have been read I want an array that has these total values in it.

I've been looking at examples and tried them but haven't been successful so far. Any pointers at all please?

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