Re: Black/Yellow Ratio Analysis

Posted by Herbie on Oct 02, 2016; 1:41pm
URL: http://imagej.273.s1.nabble.com/Black-Yellow-Ratio-Analysis-tp5017259p5017267.html

good day Meg,

just for the record:

"mobile phone camera"

If it's for serious science, don't use that "camera"!
If it's for a student project, you may perhaps...

For serious science you need a camera that provides raw images with
defined gamma, at best gamma = 1. Furthermore, you need defined
illumination and a color reference chart for later color correction.

JPEG-compressed image are a bad idea for serious science. JPEG is a
lossy compression that introduces artifacts. It is not made for machine
analysis...

I'll have a look at the provided image.

best

Herbie

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Am 02.10.16 um 15:16 schrieb Meg James:

> Hello Herbie,
>
> Thank you for your reply. I have attached a sample image taken of a
> wasp with my mobile phone camera, I will be using it to photograph
> the hoverflies this week. I will research how to use Colour
> Thresholds, thank you for the advice.
>
> Best wishes,
>
> Meg
>
> -- ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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