[tex-k] zoom problem in xdvi

[tmlam]

Hi Stefan,

The version in Solaris is 8.54. The one in Linux is compiled from source 
myself without extra configuration options. I am not if that make a 
difference.

Anyway, I can confirm that it works after toggling the anti-aliasing 
option once. With "-gsalpha" which turns on the anti-aliasing, it will 
still have the zoom problem with figures. Turning it off afterward 
solved it instead.

Regards,

TM Lam

On 3/3/2010 5:36 PM, Stefan Ulrich wrote:
> Hi,
>
> yes I meant the -gsalpha or +gsalpha option for xdvi and the 'v'
> keystroke for xdvi (to toggle PS display), or 'V' to turn
> anti-aliasing on or off. The latter will actually restart the gs
> process, so it should be a workaround for this issue.
>
> Please compare the ghostscript versions on Linux (where it's broken)
> with those on Solaris (where it works). Last time I looked there was
> performance optimization in newer ghostscript versions that didn't
> recompute the anti-aliased images when the zoom factor changed, but I
> couldn't find out how to work around this in xdvi. I'm a bit surprised
> that it also happens with anti-aliasing off; could you please
> double-check this? (Use the +gsalpha option to turn if off, or check
> that the menu option is switched off).
>
> Best regards,
> Stefan
>
> On Wed, Mar 3, 2010 at 10:06 AM, tmlam<tmlam at se.cuhk.edu.hk>  wrote:
>> Hi Stefan,
>>
>> I think you meant -gsalpha with xdvi. Anyway, as I said, turning
>> anti-aliasing on with -gsalpha does not help but turning it off afterward
>> solved the problem. However, xdvi by default does not turn on anti-aliasing
>> by default (unless with -gsalpha). Somehow by turning it on to off solves
>> the problem. Therefore, I believe there is something wrong.
>>
>> Regards,
>>
>> TM Lam
>>
>> On 3/3/2010 4:39 PM, tmlam wrote:
>>>
>>> Hi Stefan,
>>>
>>> Ghostscript is 8.64. I suppose the option -gsapha is to be used with gs.
>>> However, gs is invoked by xdvi. How can we pass the option to gs through
>>> xdvi?
>>>
>>> In fact, you are right about the anti-aliasing. There is an option
>>> button in xdvi that allow turning PS anti-aliasing on/off. By turn it to
>>> on, and then off, the figures can be displayed normally after zooming.
>>> Very strange.
>>>
>>> I don't know how to switch postscript on/off. What keystroke we need to
>>> press? I assume it is for xdvi.
>>>
>>> Many thanks for you ideas.
>>>
>>> Regards,
>>>
>>> TM Lam
>>>
>>>
>>>
>>> On 3/3/2010 3:37 PM, Stefan Ulrich wrote:
>>>>
>>>> Hi,
>>>>
>>>> Usually such problems are related to ghostscript. What are the
>>>> ghostscript versions on these installations? Does the behaviour change
>>>> if you switch off Postscript anti-aliasing (Menu or -gsapha option)?
>>>> Does it work after you switch postscript on/off (v keystroke)?
>>>>
>>>> Best regards,
>>>> Stefan
>>>>
>>>> On Wed, Mar 3, 2010 at 5:18 AM, tmlam<tmlam at se.cuhk.edu.hk>  wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> It seems that the xdvi in Linux has problem when zooming in. The figures
>>>>> (eps) will not zoom correctly. In fact, part of the figure will be
>>>>> vanished.
>>>>> I tried the xdvi in texlive 2009, the original xdvi in CentOS 5.4,
>>>>> both have
>>>>> this problem. However, running xdvi (texlive 2009) on Solaris (SPARC)
>>>>> does
>>>>> not have this problem.
>>>>>
>>>>> Is there a fix in Linux?
>>>>>
>>>>> TIA,
>>>>>
>>>>> TM Lam
>>>>>
>>>>>
>>
>>