How to avoid Out of Memory (error code 00000006, return code 0) when using the print command?

I perform the following command after generating a figure :

print (gcf, '-dbitmap', [num2str(reg) '_' Name1 '.bmp'])

this works fine when I'm at work but when my computer is locked (I use a scheduled task) it generates the following error:

Warning: Failed in BitBlt, last error code 00000006, return code 0 
> In C:\Program Files\MATLAB\R2014a\toolbox\matlab\graphics\hardcopy.p>hardcopy at 36
  In graphics\private\render at 109
  In print>LocalPrint at 276
  In print at 233
  In TTS_GEM at 42 
Error using print>LocalPrint (line 291)
Out of memory. Type HELP MEMORY for your options.

Error in print (line 233)
    LocalPrint(pj);

Error in TTS_GEM (line 42)
    print (gcf, '-dbitmap', [num2str(reg) '_' Name1 '.bmp'])

I read the following answer to a previous question in the forum:

The SAVEAS function uses the '-dbitmap' option to print, which works by performing a screen capture. Since the screen is locked, the data cannot be captured.

To work around this, use the PRINT command to save the figure as a BMP-file.

print (gcf, '-dbmp', 'myfile.bmp')

The point is that using '-dbmp' instead of '-dbitmap' doesn't yield the same results (the chart is unreadable).

How can I avoid this and be able to save a good quality chart when my computer is locked at night?

[Geoff Hayes]

Rather than saving the figure as a bitmap, perhaps try to save just the figure and (later, once the computer is unlocked) manually save the figure as a bitmap. See http://www.mathworks.com/help/matlab/ref/savefig.html for usage of the savefig function.