how to make a mini photoshop

hi. i wrote some codes to make a mini photoshop. a buttom to upload a pic. a slidbar for changeing brightness and a slidbar for changing contrastcontrast.

all work well but there is a problem. if i change the brightness(contrast), then when i want to change contrast(brightness) it will not affect to the pic that i changed. in fact it just affects on the orginal pic. how can i solve the problem ? plz help me.

function varargout = photoeditor(varargin)
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @photoeditor_OpeningFcn, ...
                   'gui_OutputFcn',  @photoeditor_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end


function photoeditor_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
guidata(hObject, handles);


function varargout = photoeditor_OutputFcn(hObject, eventdata, handles) 
varargout{1} = handles.output;


function insertpic_Callback(hObject, eventdata, handles)
    [File_Name, Path_Name] = uigetfile({'*.jpg';'*.bmp';'*.png';},'Select Image','E:\installed programs\matlab\matlab\work\GUI\photoeditor');
    if(File_Name~=0)
       img=strcat(Path_Name,File_Name);
       axes(handles.axes1);
       imagefile=imread(img);
       imshow(img);
       handles.image =imagefile;
       guidata(hObject, handles);
    else
        return;
    end
    

function brightness_Callback(hObject, eventdata, handles)
if isfield(handles, 'image')
    brightval=0.5*get(hObject, 'value')-0.5;
    imbright=double(handles.image)+brightval;               
    imshow(uint8(imbright), 'Parent', handles.axes1); 
    guidata(hObject, handles);
end


function brightness_CreateFcn(hObject, eventdata, handles)
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
end


function contrast_Callback(hObject, eventdata, handles)
if(isfield(handles,'image'))
    low = get(hObject,'value');
    high = 1;
    imcontrast = imadjust(handles.image,[low high],[]);
    imshow(uint8(imcontrast), 'Parent', handles.axes1);
    guidata(hObject, handles);
end

Answer 1

[reza hamzeh]

plz help me

[Lin JingHeng]

Excuse me, l have the same question when doing a project, do you know how to solve it now?

[reza hamzeh]

no sry

Answer 2

[Image Analyst]

See Steve Eddins's blog series :Don't Photoshop it...MATLAB it!

Answer 3

[DGM]

This problem happens because both functions start over from the source image every time they are called.

imbright = double(handles.image)+brightval; 
% ...
imcontrast = imadjust(handles.image,[low high],[]);      

Instead of making a unique working image for each function, have one working image that's used by all functions. If you don't need to preserve a copy of the original source image, just use it. Otherwise, define a working image and write to it.

When loading a new image or reverting to the original:

handles.workingimg = handles.image;

When operating on it:

workingimg = double(handles.workingimg)+brightval; 
% ...
workingimg = imadjust(handles.workingimg,[low high],[]);