shili75.m

1-32是：图形应用篇 33-66是：界面设计篇 67-84是：图形处理篇 85-100是：数值分析篇

h0=figure('toolbar','none',...
    'position',[198 56 350 468],...
    'name','实例75');
h1=axes('parent',h0,...
    'position',[0.12 0.45 0.75 0.5],...
    'visible','off');
I=imread('flowers.tif');
imshow(I)
b1=uicontrol('parent',h0,...
    'units','points',...
    'tag','b1',...
    'style','pushbutton',...
    'string','减少颜色',...
    'backgroundcolor',[0.75 0.75 0.75],...
    'position',[30 100 50 20],...
    'callback',[...
        'cla,',...
        '[X,map]=imread(''flowers.tif'');,',...
        '[Y,map2]=imapprox(X,map,64);,',...
        'image(Y),',...
        'colormap(map2)']);
b2=uicontrol('parent',h0,...
    'units','points',...
    'tag','b2',...
    'style','pushbutton',...
    'string','颜色抖动',...
    'backgroundcolor',[0.75 0.75 0.75],...
    'position',[100 100 50 20],...
    'callback',[...
        'cla,',...
        'I=imread(''flowers.tif'');,',...
        '[X,map]=rgb2ind(I,128,''nodither'');,',...
        'imshow(X)']);
b3=uicontrol('parent',h0,...
    'units','points',...
    'tag','b3',...
    'style','pushbutton',...
    'string','颜色转换一',...
    'backgroundcolor',[0.75 0.75 0.75],...
    'position',[170 100 50 20],...
    'callback',[...
        'cla,',...
        'I=imread(''flowers.tif'');,',...
        'Y=rgb2ntsc(I);,',...
        'J=Y(:,:,1);,',...
        'imshow(J)']);
b4=uicontrol('parent',h0,...
    'units','points',...
    'tag','b4',...
    'style','pushbutton',...
    'string','关闭',...
    'backgroundcolor',[0.75 0.75 0.75],...
    'position',[170 50 50 20],...
    'callback','close');
b5=uicontrol('parent',h0,...
    'units','points',...
    'tag','b5',...
    'style','pushbutton',...
    'string','颜色转换三',...
    'backgroundcolor',[0.75 0.75 0.75],...
    'position',[100 50 50 20],...
    'callback',[...
        'cla,',...
        'I=imread(''flowers.tif'');,',...
        'J=rgb2ycbcr(I);,',...
        'imshow(J)']);
b6=uicontrol('parent',h0,...
    'units','points',...
    'tag','b6',...
    'style','pushbutton',...
    'string','颜色转换二',...
    'backgroundcolor',[0.75 0.75 0.75],...
    'position',[30 50 50 20],...
    'callback',[...
        'cla,',...
        'I=imread(''flowers.tif'');,',...
        'J=rgb2hsv(I);,',...
        'imshow(J)']);