Psychtoolbox-3: Error using Screen

Hi all, this bit of code is from an entire script keeps closing out w/ error and I am not sure why.The error message reads the following:

"Usage:

textureIndex=Screen('MakeTexture', WindowIndex, imageMatrix [, optimizeForDrawAngle=0] [, specialFlags=0] [, floatprecision] [, textureOrientation=0] [,

textureShader=0]);

Error in punishment_ar_att_v3 (line 285)

image = Screen('MakeTexture', onScreen, item);

%%%%%%%%%%%%%%%%%%%

Screen('Preference', 'SkipSyncTests', 1);

%%% Screen Dimensions %%%

screens = Screen('Screens'); %count the screen

minScreens = min(screens);

[onScreen, screenRect] = Screen('OpenWindow', minScreens); % Open the second window

%[ScreenX, ScreenY] = WindowSize(onScreen);

ScreenX = screenRect(3);

ScreenY = screenRect(4);

cx=(ScreenX/2); %Middle of screen on X-axis

cy=(ScreenY/2); %Middle of screen on Y-axis

ScreenRect = [0 0 ScreenX ScreenY]; %Rectangle = size of whole display

cd charities;

charList = dir('*.jpg'); % Get pics

nChar = find([charList.bytes]>1000);

charList = charList(nChar);

nChars = length(charList); % How many?

cd ..;

charTex = zeros(1,length(charList)); % create an empty cell array to store each new texture

for i = 1:length(charList)

cd charities;

item = (charList(i).name);

cd ..;

image = Screen('MakeTexture', onScreen, item);

charTex(i) = image;

end

Answer 1

[Walter Roberson]

You are passing a name in, but you need to pass the image content instead. So you need to imread()

[Jade T]

Thanks much! This definitely works!

Answer 2

[VBBV]

charTex = cell(1,length(charList)); % create an empty cell array to store each new texture
  for i = 1:length(charList)
      cd charities;
      item = (charList(i).name);
          %cd ..; 
      image = Screen('MakeTexture', onScreen, item);
      charTex{i} = image;
  end

[Jade T]

The curly brackets! Thanks much, i knew something was off with the indexing but for some reason I though that the parentheses worked despite it being a cell array