Sean, try this code:
% Demo to create JPG copies of BMP files in a different folder.
% By Image Analyst
% inputFolder = fileparts(which('cameraman.tif')) % Determine where demo folder is (works with all versions).
inputFolder = fullfile(pwd, 'Project\Matlab Folder\BMP Data');
filePattern = fullfile(inputFolder, '*.bmp')
% Get list of all BMP files in input folder
bmpFiles = dir(filePattern)
% Create the output folder:
outputFolder = fullfile(pwd, 'Project\Matlab Folder\JPEG Data')
if ~exist(outputFolder, 'dir')
mkdir(outputFolder);
end
figure;
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Loop over all bmp files, making a jpg version
% of them in the output folder.
for k = 1 : length(bmpFiles)
% Read in .bmp file
baseFileName = bmpFiles(k).name;
fullFileNameInput = fullfile(inputFolder, baseFileName)
rgbImage = imread(fullFileNameInput);
subplot(1, 2, 1);
imshow(rgbImage);
title('Original image', 'FontSize', 30);
drawnow;
% Prepare output file name
fullFileNameOutput = fullfile(outputFolder, baseFileName);
% Converts to JPEG and gives it the .jpg extension
fullFileNameOutput = strrep(lower(fullFileNameOutput), '.bmp', 'jpg')
imwrite(rgbImage,fullFileNameOutput);
% Reloads it in a JPEG format to see how bad the compression artifacts are.
rgbImage = imread(fullFileNameOutput);
subplot(1, 2, 2);
imshow(rgbImage);
title('Recalled JPG image', 'FontSize', 30);
drawnow;
pause(1);
end
% Open Windows Explorer to the output folder:
winopen(outputFolder);
