Thread Subject: Problem saving figures Strange White Areas

Hi,

I barely know what a pixel is so I need help for the followong problem:

I have a figure h=figure(1) and I am trying to save it as an image (bmp or png) I use:

 saveas(h,'path','name.bmp')

It seems everything right to me but when I look at the saved image I notice that there are white areas where in the original figure they where black.

These white areas appears like a flash during the execution of the saveas command ?????

Does anybody knows anything about this problem?

Thank you

On Oct 14, 6:20 am, "Luigi Giaccari" <giaccarilu...@msn.com> wrote:
> Hi,
>
> I barely know what a pixel is so I need help for the followong problem:
>
> I have a figure h=figure(1) and I am trying to save it as an image (bmp or png) I use:
>
>  saveas(h,'path','name.bmp')
>
> It seems everything right to me but when I look at the saved image I notice that there are white areas where in the original figure they where black.
>
> These white areas appears like a flash during the execution of the saveas command ?????
>
> Does anybody knows anything about this problem?
>
> Thank you

------------------------------------------------------------
I don't use the poor MATLAB methods - it seems there are always
problems. Try using Oliver Woodford's excellent export_fig. It's
much better. It's in the File Exchange.

ImageAnalyst <imageanalyst@mailinator.com> wrote in message <ea20e2f4-7a56-4982-aca3-d58fd3e9a781@z24g2000yqb.googlegroups.com>...
> On Oct 14, 6:20?am, "Luigi Giaccari" <giaccarilu...@msn.com> wrote:
> > Hi,
> >
> > I barely know what a pixel is so I need help for the followong problem:
> >
> > I have a figure h=figure(1) and I am trying to save it as an image (bmp or png) I use:
> >
> > ?saveas(h,'path','name.bmp')
> >
> > It seems everything right to me but when I look at the saved image I notice that there are white areas where in the original figure they where black.
> >
> > These white areas appears like a flash during the execution of the saveas command ?????
> >
> > Does anybody knows anything about this problem?
> >
> > Thank you
>
> ------------------------------------------------------------
> I don't use the poor MATLAB methods - it seems there are always
> problems. Try using Oliver Woodford's excellent export_fig. It's
> much better. It's in the File Exchange.

Thank you,

It seems that the problem is caused because the matlab routine consider the figure background color always white even if it is set to black.

I solved it adding an uicontrol text colored in black. A little rough but it works.

"Luigi Giaccari" <giaccariluigi@msn.com> wrote in message
news:hb4bcm$ojo$1@fred.mathworks.com...
> ImageAnalyst <imageanalyst@mailinator.com> wrote in message
> <ea20e2f4-7a56-4982-aca3-d58fd3e9a781@z24g2000yqb.googlegroups.com>...
>> On Oct 14, 6:20?am, "Luigi Giaccari" <giaccarilu...@msn.com> wrote:
>> > Hi,
>> >
>> > I barely know what a pixel is so I need help for the followong problem:
>> >
>> > I have a figure h=figure(1) and I am trying to save it as an image (bmp
>> > or png) I use:
>> >
>> > ?saveas(h,'path','name.bmp')
>> >
>> > It seems everything right to me but when I look at the saved image I
>> > notice that there are white areas where in the original figure they
>> > where black.
>> >
>> > These white areas appears like a flash during the execution of the
>> > saveas command ?????
>> >
>> > Does anybody knows anything about this problem?
>> >
>> > Thank you
>>
>> ------------------------------------------------------------
>> I don't use the poor MATLAB methods - it seems there are always
>> problems. Try using Oliver Woodford's excellent export_fig. It's
>> much better. It's in the File Exchange.
>
> Thank you,
>
> It seems that the problem is caused because the matlab routine consider
> the figure background color always white even if it is set to black.
>
> I solved it adding an uicontrol text colored in black. A little rough but
> it works.

If I understand the problem you describe correctly, a better solution is to
use the SET function to change the figure's InvertHardcopy property to
'off':

http://www.mathworks.com/access/helpdesk/help/techdoc/ref/figure_props.html#InvertHardcopy

That section of the documentation explains why, by default, we "switch" the
background color of the figure when you export it and changing that property
will disable this behavior.

--
Steve Lord
slord@mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ