What does the numerical digits in the text box stands for when i adjust my slider. For both Contrast & Brightness

Brightness Slider:

% --- Executes on slider movement.
function slider_brightness_Callback(hObject, eventdata, handles)
% hObject    handle to slider_brightness (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider

A = get(handles.slider_brightness,'Value');

AFMimage = handles.AFM_Adjust;
a = get(hObject,'Value');
BadjAFMimage = imadd(AFMimage,a);
handles.AFM_BAdjust = BadjAFMimage;

axes(handles.axes1); imshow(BadjAFMimage);
axes(handles.axes4); imhist(BadjAFMimage);

set(handles.slider_brightness,'Value',A);
set(handles.Btext,'String',num2str(A));

imwrite(BadjAFMimage,'Enhance Image.jpg','jpg')

% Update handles structure
guidata(hObject, handles);

Contrast Slider:

% --- Executes on slider movement.
function slider_contrast_Callback(hObject, eventdata, handles)
% hObject    handle to slider_contrast (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider

A = get(handles.slider_contrast,'Value');

AFMimage = handles.AFM_Adjust;
a = get(hObject,'Value');
BadjAFMimage = imadjust(AFMimage,[],[], a);
handles.AFM_BAdjust = BadjAFMimage;

axes(handles.axes1); imshow(BadjAFMimage);
axes(handles.axes4); imhist(BadjAFMimage);

set(handles.slider_contrast,'Value',A);
set(handles.Ctext,'String',num2str(A));

imwrite(BadjAFMimage,'Enhanced contrast Image.jpg','jpg')

% Update handles structure
guidata(hObject, handles);

Answer 1

[Walter Roberson]

For the Contrast slider: gamma. For the brightness slider, the amount to add to each component of each pixel.