[Radiance-general] How to get extreme values from a falsecolor image

[Vaib]

Thank you!

I feel terrible, I should have been cautious (I need sleep).. My HDR was
currupt, as I stopped my Java procedures in the middle... I am sorry..

Yes, pextrem works fine..  Thank you Dr.Jacob for -s -a.

Vaib


On 5 February 2014 18:38, Guglielmetti, Robert <Robert.Guglielmetti at nrel.gov
> wrote:

> Shit, it appears that the -a option fell off the wagon when falsecolor was
> converted from a csh script to a Perl script. I swear it used to be there.
> Am I losing my mind? This is entirely possible. OK, ok, bad info there.
> Sorry about that one, Vaib.
>
>
>
> Now then, the pextrem deal. What do you mean it doesn't take an hdr file?
> That's precisely what it does. Here's what that should look like:
>
>
>
> $ pextrem pass2-v2lux.hdr
>
> 99 511   0.000000e+00 0.000000e+00 0.000000e+00
>
> 4 232      9.960938e-01 9.960938e-01 9.960938e-01
>
>
>
> IOW, you call pextrem, give it an hdr image, and it returns the pixel
> coordinates (x,y) and radiance (Rr,Rg,Rb) of the low and high pixels.
> What's happening when you try this?
>
>
>
>
>
> *From:* Vaib [mailto:vaibhavjain.co at gmail.com]
> *Sent:* Wednesday, February 05, 2014 10:25 AM
> *To:* Radiance general discussion
> *Subject:* Re: [Radiance-general] How to get extreme values from a
> falsecolor image
>
>
>
> Thank you Rob.
>
>
>
> Am I doing it wrong? -a option is a "bad option" :) Not valid argument I
> mean..
>
>  $ falsecolor -i foo.hdr -s 1000 -n 10 -l Lux -a > bar.hdr
>
>
>
> And pextrem doesn't take HDR file. I have to work with HDR, as it has
> conversion libraries in Java.
>
>
>
> Vaib
>
>
>
> On 5 February 2014 17:50, Guglielmetti, Robert <
> Robert.Guglielmetti at nrel.gov> wrote:
>
> Hi Vaib,
>
>
>
> A couple of things:
>
>
>
> Thing One: there is an -a option, which "autoscales" the max value for the
> scale to peak at the max value found in the image.
>
> Thing Two: yes, you can use pextrem to get the min and max values (in
> Rr,Rg,Rb) printed to the command line.
>
>
>
> - Rob
>
>
>
> *From:* Vaib [mailto:vaibhavjain.co at gmail.com]
> *Sent:* Wednesday, February 05, 2014 9:39 AM
> *To:* Radiance general discussion
> *Subject:* [Radiance-general] How to get extreme values from a falsecolor
> image
>
>
>
> Hello everyone,
>
>
>
> Falsecolor's documentation states that "The *-e* option causes extrema
> points to be printed on the brightest and darkest pixels of the input
> picture."
>
>
>
> Is there any way to output (not print on image) the extrema values? This
> could be helpful in appropriately scaling the "scale".
>
>
>
> Thank you!
>
>
>
> Best regards,
>
> Vaib
>
>
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