[rrd-users] Re: Graph data is affected by the size of PNG image

[Alejandro Galue]

Hello Dan,
Thanks for your quick response. I really appretiate that.

I included an attach with two files inside:

the RRD called  379.framerelay1.rrd
a perl script called graph.pl

This file generate the graphs for the tests.

The small graph use (500x150) and the big graph use (800x300)

I used "step=300:reduce=MAX" and "step=300" alone with no success, but 
the graphs is a little bit better than with or widthout "reduce=MAX".

reduce=MAX is used for pixel reduction technique and is not related to 
consolidation function used to fetch data; am I right ?
Is this a Bug ?

Thanks,
Alejandro Galue.

Dan Cech wrote:
> Alejandro Galue wrote:
>> Hello,
>>
>> I'm using rrdtool 1.12.15, and I have problems with image resolution and 
>> the data showed in graphs.
>>
>> I attached two graphs as example:
>>
>> Graph 1
>> http://lists.ee.ethz.ch/p/03-g1.png
>>
>> Graph 2
>> http://lists.ee.ethz.ch/p/03-g2.png
>>
>> The real data is showed on "Graph 2" (the big one); but "Graph 1" (the
>> small one) shows non valid data.
>>
>> If you see Graph 1, almost all peaks dissapears from graph.
>>
>> I used "reduce=MAX" on DEF lines but this does not work.
> 
> You need to provide us with more background on the structure of the rrds
> and the graph commands.
> 
> My guess would be that you are using reduce=MAX on a DS that isn't MAX,
> and without a step specified the different size graph is using different
> resolution data, which has already been aggregated, do the peaks are
> already gone.
> 
> Dan
> 
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