Max pixel value on satellite image

I have DailyET.tif map and I want to find max pixel value and pixel location (x,y)....

When I try it

a=imread('DailyET.tif');

than I open "A" at workspace I see pixel value but not have all pixels.(only have 7251*8091 single value)

how can I open image with all pixel information???

Answer 1

[Image Analyst]

You can use the zoom() function. Set up a scroll bar to set different zoom factors.

To find the max value and location(s):

maxGrayLevel = max(grayImage(:));
[rowsMax, columnsMax] = find(grayImage == maxGrayLevel);

[Image Analyst]

Emre's "Answer" moved here:

when I try this code Matlab give me to error Undefined variable grayImage.

how can I use this code ???

maxGrayLevel = max(grayImage(:)); 
[rowsMax, columnsMax] = find(grayImage == maxGrayLevel);

[Image Analyst]

Well, you have to replace grayImage with the name of your image variable. Here's an example:

fullFileName = 'cameraman.tif';
grayImage = imread(fullFileName);
maxGrayLevel = max(grayImage(:))
[rowsMax, columnsMax] = find(grayImage == maxGrayLevel)

Of course you chose the very poor name of a so your code would look like this:

fullFileName = 'cameraman.tif';
a = imread(fullFileName);
maxGrayLevel = max(a(:))
[rowsMax, columnsMax] = find(a == maxGrayLevel)

I recommend that you use descriptive variable names and don't have your code look like an alphabet soup of random single letter variables.