1. 程式人生 > >Matlab繪圖基礎——用print函數保存圖片(Print figure or save to file)

Matlab繪圖基礎——用print函數保存圖片(Print figure or save to file)

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一、用法解析... 1

1.1. 分辨率-rnumber. 1

1.2. 輸出圖片的“格式”formats. 1

二、用法示例... 1

2.1. 設置輸出圖片的“圖像縱橫比”... 1

2.2. Batch Processing(圖片保存“批處理”)filename. 1

1.2. 輸出圖片的“格式”formats. 1

一、用法解析

print(figure_handle,‘formats‘,‘-rnumber‘,‘filename‘)

%將圖形保存為formats格式

,分辨率為600的(默認為72),最好指定的分辨率大一點,否則保存圖形的效果較差.

1.1. 分辨率-rnumber

Use -rnumber to specify the resolution of the generated output.

To set the resolution(分辨率) of the output file for a built-in MATLAB format, use the -r switch.

l For example, -r300 sets the output resolution to 300 dots per inch(每英寸300個點)

The –r switch is also supported for Windows Enhanced Metafiles

(增強型圖元文件), JPEG, TIFF and PNG files, but is not supported for Ghostscript raster formats(柵格文件).

l For more information, see Printing and Exporting without a DisplayandResolution Considerations.

—— 來自matlab幫助“print”頁中

1.2. 輸出圖片的“格式”formats

請參考本文末尾

二、用法示例

% Save the figure with the handle h to a PostScript file named Figure1, which can be printed later.

H = figure; % 指定圖片打印figure_handles

% 若沒有figure_handle,則默認print當前顯示圖片

plot(1:4,5:8)

print(h,‘-dpng‘,‘-r200‘,‘Figure1‘) % 這三行代碼就夠用了

2.1. 設置輸出圖片的“圖像縱橫比”

When you set the axes Position to [0 0 1 1] so that it fills the entire figure, the aspect ratio is not preserved when you print because MATLAB printing software adjusts the figure size when printing according to the figure‘s PaperPositionproperty. To preserve the image aspect ratio圖像縱橫比 when printing, set the figure‘s ‘PaperPositionMode‘ to ‘auto‘ from the command line.

set(gcf,‘PaperPositionMode‘,‘auto‘)

% Setting the current figure‘s (gcf) PaperPositionMode to auto enables

% you to resize the figure window and print it at the size you see on the screen.

舉例

surf(peaks);shading interp % 畫圖,shading使圖像美觀

axis off % 不顯示坐標軸

set(gcf,‘PaperPositionMode‘,‘auto‘); % 設置圖像縱橫比

print(‘-dpng‘,‘-r200‘,‘a‘); % 保存圖片,名為a

——來自matlab幫助 Printing Images

2.2. Batch Processing(圖片保存“批處理”)filename

You can use the function form of print to pass variables containing file names. For example, this for loop uses file names stored in a cell array to create a series of graphs and prints each one with a different file name:

fnames = {‘file1‘, ‘file2‘, ‘file3‘};

for k=1:length(fnames)

surf(peaks);shading interp

print(‘-dtiff‘,‘-r600‘,fnames{k}) % fnames is a cell of string arrays so each element is a string

end

————來自matlab幫助“print”頁末

註:如果你不能調整輸出分辨率和文件格式,可能是"Printing and Exporting without a Display"問題,具體查看幫助“print”

———分割線————————————————————————————

1.2. 輸出圖片的“格式”formats

The following table shows the supported output formats for exporting from figures and the switch settings to use. In some cases, a format is available both as a MATLAB output filter and as a Ghostscript output filter. All formats except for EMF are supported on both Windows and UNIX platforms.

Graphics Format

Bitmap or Vector(矢量)

Print Command

Option String

MATLAB or

Ghostscript

BMP monochrome BMP

Bitmap

-dbmpmono

Ghostscript

BMP 24-bit BMP

Bitmap

-dbmp16m

Ghostscript

BMP 8-bit (256-color) BMP (this format uses a fixed colormap)

Bitmap

-dbmp256

Ghostscript

BMP 24-bit

Bitmap

-dbmp

MATLAB

EMF

Vector

-dmeta

MATLAB

EPS black and white

Vector

-deps

MATLAB

EPS color

Vector

-depsc

MATLAB

EPS Level 2 black and white

Vector

-deps2

MATLAB

EPS Level 2 color

Vector

-depsc2

MATLAB

HDF 24-bit

Bitmap

-dhdf

MATLAB

ILL (Adobe Illustrator)

Vector

-dill

MATLAB

JPEG 24-bit

Bitmap

-djpeg

MATLAB

PBM (plain format) 1-bit

Bitmap

-dpbm

Ghostscript

PBM (raw format) 1-bit

Bitmap

-dpbmraw

Ghostscript

PCX 1-bit

Bitmap

-dpcxmono

Ghostscript

PCX 24-bit color PCX file format, three 8-bit planes

Bitmap

-dpcx24b

Ghostscript

PCX 8-bit newer color PCX file format (256-color)

Bitmap

-dpcx256

Ghostscript

PCX Older color PCX file format (EGA/VGA, 16-color)

Bitmap

-dpcx16

Ghostscript

PDF Color PDF file format

Vector

-dpdf

Ghostscript

PGM Portable Graymap (plain format)

Bitmap

-dpgm

Ghostscript

PGM Portable Graymap (raw format)

Bitmap

-dpgmraw

Ghostscript

PNG 24-bit

Bitmap

-dpng

MATLAB

PPM Portable Pixmap (plain format)

Bitmap

-dppm

Ghostscript

PPM Portable Pixmap (raw format)

Bitmap

-dppmraw

Ghostscript

SVG Scalable Vector Graphics (For Simulink Models Only)

Vector

-dsvg

MATLAB

TIFF 24-bit

Bitmap

-dtiff or -dtiffn

MATLAB

TIFF preview for EPS files

Bitmap

-tiff

Matlab繪圖基礎——用print函數保存圖片(Print figure or save to file)