MATLAB Central Newsreader - export_fig: image resolution/size

export_fig: image resolution/size

RUSSELL — Thu, 08 Oct 2009 18:20:19 -0400

hi there

I have finally managed to get my figures to have transparency via export_fig! yeee haaaa!
for anyone wondering how this is done, i had to set :

set(gca,'color','none')
set(gcf,'color','none')

and then

export_fig('-png','-nocrop','-opengl','-r300','outputfilename')

however, i cant seem to get the output image to change size in resolution and dimensions. i have searched the help and forum extensively but nothing seems to work.

I have tried things like:

export_fig('PaperUnits','centimeters','PaperSize',[20. 20.],'-dpng','-nocrop','-opengl','-r2000','Testpng')

but nothing happens.. have also put the papersize command in the

figure(...) bit.

changing -r in the export_fig doesnt seem to do anything.. every time i open the output file its quite small and around 72dpi

any suggestions would be great!!!!!

cheers
Russ

Re: export_fig: image resolution/size

the cyclist — Thu, 08 Oct 2009 18:39:03 -0400

"RUSSELL " <r.johnston@physics.gla.ac.uk> wrote in message <halah3$2ak$1@fred.mathworks.com>...
> hi there
>
> I have finally managed to get my figures to have transparency via export_fig! yeee haaaa!
> for anyone wondering how this is done, i had to set :
>
> set(gca,'color','none')
> set(gcf,'color','none')
>
> and then
>
> export_fig('-png','-nocrop','-opengl','-r300','outputfilename')
>
> however, i cant seem to get the output image to change size in resolution and dimensions. i have searched the help and forum extensively but nothing seems to work.
>
> I have tried things like:
>
> export_fig('PaperUnits','centimeters','PaperSize',[20. 20.],'-dpng','-nocrop','-opengl','-r2000','Testpng')
>
> but nothing happens.. have also put the papersize command in the
>
> figure(...) bit.
>
>
> changing -r in the export_fig doesnt seem to do anything.. every time i open the output file its quite small and around 72dpi
>
> any suggestions would be great!!!!!

I think you need to set the 'PaperPosition' attribute of the figure object.

Re: export_fig: image resolution/size

RUSSELL — Thu, 08 Oct 2009 19:02:02 -0400

"the cyclist" <thecyclist+mathworks_newsgroup@gmail.com> wrote in message <halbk7$gjj$1@fred.mathworks.com>...
> "RUSSELL " <r.johnston@physics.gla.ac.uk> wrote in message <halah3$2ak$1@fred.mathworks.com>...

> I think you need to set the 'PaperPosition' attribute of the figure object.

do you mean:

figure1=figure('paperunits','centimeters','paperposition', [0 0 20 20]);

if so, nothing changes

Re: export_fig: image resolution/size

Oliver Woodford — Fri, 09 Oct 2009 08:36:02 -0400

Hi Russ

export_fig doesn't take all the options that print does. I'm considering adding in the ability to increase resolution with an input parameter, but at the moment that feature isn't available.

However, as stated in the help text, export_fig exports figures exactly as they appear on screen - that includes the size. If you want a larger (i.e. higher resolution) image, make the figure larger.

HTH,
Oliver

"RUSSELL " <r.johnston@physics.gla.ac.uk> wrote in message <halah3$2ak$1@fred.mathworks.com>...
> hi there
>
> I have finally managed to get my figures to have transparency via export_fig! yeee haaaa!
> for anyone wondering how this is done, i had to set :
>
> set(gca,'color','none')
> set(gcf,'color','none')
>
> and then
>
> export_fig('-png','-nocrop','-opengl','-r300','outputfilename')
>
> however, i cant seem to get the output image to change size in resolution and dimensions. i have searched the help and forum extensively but nothing seems to work.
>
> I have tried things like:
>
> export_fig('PaperUnits','centimeters','PaperSize',[20. 20.],'-dpng','-nocrop','-opengl','-r2000','Testpng')
>
> but nothing happens.. have also put the papersize command in the
>
> figure(...) bit.
>
>
> changing -r in the export_fig doesnt seem to do anything.. every time i open the output file its quite small and around 72dpi
>
> any suggestions would be great!!!!!
>
> cheers
> Russ
>
>
>
>
>
>

Re: export_fig: image resolution/size

Oliver Woodford — Fri, 09 Oct 2009 10:02:02 -0400

"Oliver Woodford" wrote:
> export_fig doesn't take all the options that print does. I'm considering adding in the ability to increase resolution with an input parameter, but at the moment that feature isn't available.

Hold the phone. I've just added the ability to export bitmaps at an arbitrary resolution, and uploaded it to the FEX. It should appear within the next few days.

The resolution is changed with the -m<value> option (not the -r<value> option used by print), where value is the factor to magnify the on-screen figure dimensions by. I.e. -m2.5 produces a bitmap with 2.5 times the resolution of the source figure. Hopefully this is more intuitive than dpi.

Oliver

Re: export_fig: image resolution/size

RUSSELL — Fri, 09 Oct 2009 13:28:02 -0400

"Oliver Woodford" <o.j.woodford.98@cantab.net> wrote in message <hamsli$r8t$1@fred.mathworks.com>...
> Hi Russ
>
> export_fig doesn't take all the options that print does. I'm considering adding in the ability to increase resolution with an input parameter, but at the moment that feature isn't available.
>
> However, as stated in the help text, export_fig exports figures exactly as they appear on screen - that includes the size. If you want a larger (i.e. higher resolution) image, make the figure larger.
>
> HTH,
> Oliver

Hi Oliver

Thanks for taking the time to reply! :@) and i will most certainly checkout your extended bmp version when it appears!!

Ok, one last stupid question...(as you will have guessed, i am new to this):

Lets say, for example, that i plot the figure to the screen (which i have been doing). it will always appear small unless i physically drag the corner tab of the window to make it bigger or if i select 'Figure Properties', at whcih point it jumps to a huge square size on the screen.

From here, how do i use export_fig to export the figure at this new size?
If i am talking absolute rubbish, then where exatly in the code do i state the figure size?

Currently the code looks something like:
--------------------
figure1=figure;
axes1 = axes('Parent',figure1,'FontWeight','bold','FontSize',16);
set(gca,'color','none')
set(gcf,'color','none')
xlim([0 360]);
ylim([-100 100]);
box('on');
hold('all');
xlabel({'Right Ascension (DD)'},'FontWeight','demi','FontSize',20,'FontName','Times',...
'FontAngle','normal');
ylabel({'Declination (DD)'},'FontWeight','demi','FontSize',20,'FontName','Times',...
'FontAngle','normal');

plot(raSIXDF,decSIXDF,'MarkerSize',2,'Marker','.','Color',[.49 1 .63],'LineStyle','none');

export_fig('-dpng','-nocrop','-opengl','-r200','Test')

------------------

many thanks (in advance)

Russ

Re: export_fig: image resolution/size

RUSSELL — Fri, 09 Oct 2009 13:36:03 -0400

HI Oliver

Ignore that last message i posted... i figured it out!! duh!

by the way - you're script is great!

cheers