Re: [ferret_users] Limitation of gif pixel?

[Ryo Furue <furue@xxxxxxxxxx>]

Hi Dan,

| I try to produce a high resolution gif file (say 1200*1200) with
| set_pixel_size.jnl script.
| Some weird thing happen,
| if I control size below 900, the actual pixel size will increase with
| setting, like 400*400 and 800*800,
| the pixel size are about 382*382 and 756*756.
| However, if I increase size above to 900*900 (or 1200*1200),
| the actual pixel size of gif is all the same (about 856*856) with above to
| 900*900 setting.
| 
| The gif is produced with ferret normal mode, and I can see the window size
| increase until about 900*900.
| Could this problem cause by monitor resolution or graphic card limitation?

I don't know the answer to your question as it is.
But, I suggest an alternative; I thought you might
want first to generate an EPS file and then to convert
it to a high-resolution GIF, PNG, etc.

This method is potentially more flexible.  For example,
suppose you want a publication-quality image.  Then you
would need 600dpi or so.  That means that if your original
image is 3 inch by 3 inch, your GIF file would be 1800 pixels
by 1800 pixels.  That's too large for an ordinary computer
monitor.  Moreover, I can imagine that the windowing system
(in our case, the X Window) may have a limitation in the size
it can accommodate.  (You might be actually hitting such a
limit.)

Regards,
Ryo