Averaging tiff frames and writing - movie is all white?

So, I am loading in a tiff movie, selecting frames of interest and averaging them together, so that I can watch an average movie of a mouse behaving within certain time windows. I am using imwrite to save my movie (after converting each frame to double, not sure bout this though), and the final averaged tiff movie that gets saved just has all white frames. I'm sure there is a simply error I'm making to do with the way I'm formatting variables?

for stimType = 1:size(Ind_Master,3) sum_tiffs = zeros(size(AllFrames,1),size(AllFrames,2)); tiff_count = 0; mean_mov = []; for PS_frame = 1:framesPerEpoch*numEpochs for repNum = 1:size(Ind_Master,1) ref_frame = Ind_Master(repNum,1,stimType); if ref_frame < 0 break end cur_frame = ref_frame + PS_frame-1; sum_tiffs = sum_tiffs + double(AllFrames(:,:,cur_frame)); tiff_count = tiff_count + 1; end PS_frame_avg = sum_tiffs ./ tiff_count; mean_mov = cat(3,mean_mov,PS_frame_avg);

        outputFileName = [tag2 '.tif'];
        for K = 1:length(mean_mov(1,1,:))
            imwrite(mean_mov(:, :, K),outputFileName,'WriteMode', ...
                'append','Compression','none');
        end

    end
end

Answer 1

[Image Analyst]

Cast mean_mov back to uint8 before you display it or write it to disk.

And read this: http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

[Pavlov]

gracias