error using load command to load images in PNG format

I have a code to read and load variables of images in the JPG format (8bit) and it works.

This is the code :

function [frogformat ] = binned( imp )
%UNTITLED4 Summary of this function goes here
%   Detailed explanation goes here
imread (imp,'png');
load (imp);
imp = sprintf (regexprep(imp,'.png', ''));
p = double(ans);
outputname = sprintf('%s', imp);
save (outputname,'p', imp);

when I change the format to PNG (16bit) I obtain the error:

Error using load

Number of columns on line 4 of ASCII file trial4.png must be the same as previous lines.

how can I solve this?

Answer 1

[Walter Roberson]

You cannot solve the problem. load() can never be used for png files.

It would take me some research to find an image file format that load() would not error on. load() is no designed to read images.

By the way: why do you read in the image and then throw away the data that was read, by not assigning the result of imread() to a variable and not asking to display the result of imread() ?

[Stephen23]

"why do you read in the image and then throw away the data that was read, by not assigning the result of imread() to a variable"

The imported data is assigned to the default ans, which is used a few lines later. But clearly this is very obfuscated, fragile, inefficient code.

[Walter Roberson]

Urk!

[Image Analyst]

What does that code do? You failed to follow these important instructions:

%UNTITLED4 Summary of this function goes here
%   Detailed explanation goes here

What's all that stuff about regexp and sprintf about? Looks like you want to overwrite your input file with something.

Like Walter says, simply use imread() if the extension is PNG or any other image extension.

[f, baseFilenameNoExt, ext] = fileparts(imp);
if strcmpi(ext, '.png')
    theImage = imread(imp);
    % Now do something with theImage, like pass it to imshow() or whatever.
end