Re: png output -- very long processing time?

TJ,

Just a note here: if you are starting with an NCGM file and using ctrans/convert to get to a PNG, your
images will not be as high-quality as if you start with a PS file and go to PNG.

Have you tried going to a PS file instead of an NCGM, and then using
convert:

   convert -trim -geometry 1000x1000 -density 300 file.ps file.png

Of course, you may want to change the -geometry and/or density values.

--Mary

On Jul 22, 2010, at 4:38 PM, wxtofly wrote:

> Rick
> Thanks for investigating,
>
> The speed difference will make the direct png output unusable for most of my purposes.
> Using ctrans then imageMagic to convert the ncgm files is much faster, as far as I can tell.
> The process I run is real-time and the hope was that saving a step or two would speed things up.
> The better final image quality of direct png's is nice. Makes me wonder if I can't tweak how I run imageMagick's convert.
>
> TJ
>
> On 07/22/2010 02:49 PM, Rick Brownrigg wrote:
>>
>> I ran some quick tests of PNG vs. NCGM, and PNG was definitely slower,
>> by about 4 times in my case. I can imagine the difference varies
>> greatly by the visual complexity of the plot; the PNG driver must
>> perform rasterization and anti-aliasing for everything, whereas I
>> believe NCGM is a vector based format. 30 times though -- wow.
>>
>> Is this a question out of curiosity, or is this speed difference
>> causing you grief?
>>
>> Rick
>>
>> On Jul 22, 2010, at 3:25 PM, wxtofly wrote:
>>
>>
>>> Hi,
>>>
>>> Have I set it up wrong, or is png output expected to be about 10-30
>>> times slower than output to ncgm?
>>>
>>> The times below are from start of ncl to finish of each plot and are
>>> thus culmulative.
>>> As ncgm:
>>> (0) --- Single Parameter Plot end - Thu Jul 22 07:44:18 PDT 2010
>>> WallClockElapseTime= 1 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 07:44:19 PDT 2010
>>> WallClockElapseTime= 2 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 07:44:20 PDT 2010
>>> WallClockElapseTime= 3 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 07:44:20 PDT 2010
>>> WallClockElapseTime= 3 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 07:44:20 PDT 2010
>>> WallClockElapseTime= 3 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 07:44:21 PDT 2010
>>> WallClockElapseTime= 4 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 07:44:22 PDT 2010
>>> WallClockElapseTime= 5 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 07:44:22 PDT 2010
>>> WallClockElapseTime= 5 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 07:44:23 PDT 2010
>>> WallClockElapseTime= 6 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 07:44:24 PDT 2010
>>> WallClockElapseTime= 7 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 07:44:25 PDT 2010
>>> WallClockElapseTime= 8 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 07:44:25 PDT 2010
>>> WallClockElapseTime= 8 sec
>>>
>>> As png:
>>>
>>> (0) --- Single Parameter Plot end - Thu Jul 22 14:03:14 PDT 2010
>>> WallClockElapseTime= 27 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 14:03:28 PDT 2010
>>> WallClockElapseTime= 41 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 14:03:39 PDT 2010
>>> WallClockElapseTime= 52 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 14:03:52 PDT 2010
>>> WallClockElapseTime= 65 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 14:04:05 PDT 2010
>>> WallClockElapseTime= 78 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 14:04:18 PDT 2010
>>> WallClockElapseTime= 91 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 14:04:29 PDT 2010
>>> WallClockElapseTime= 102 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 14:04:44 PDT 2010
>>> WallClockElapseTime= 117 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 14:04:56 PDT 2010
>>> WallClockElapseTime= 129 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 14:05:08 PDT 2010
>>> WallClockElapseTime= 141 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 14:05:20 PDT 2010
>>> WallClockElapseTime= 153 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 14:05:35 PDT 2010
>>> WallClockElapseTime= 168 sec
>>> (0) --- Single Parameter Plot end - Thu Jul 22 14:05:51 PDT 2010
>>> WallClockElapseTime= 184 sec
>>>
>>> Might this have to do with the background image question of my prior
>>> post?
>>>
>>> TJ
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Received on Fri Jul 23 08:07:48 2010