Hi Ken,

To turn itemRgb on, you need to have the exact text: itemRgb="On" in 
your track line, as is demonstrated in the Example 5 BED track here: 
http://genome.ucsc.edu/goldenPath/help/customTrack.html#BED.

Yes, you will need to put in place-holding values for the fields for 
which you do not have information. Here are some example default values:

4. name: .
5. score: 0
6. strand: .
7. thickStart: chromStart
8. thickEnd: chromEnd
9. itemRgb: 0,0,0

We appreciate your suggestion for the modification of the BED 
specification and will pass this request on to our developers.

Best,
Mary
------------------
Mary Goldman
UCSC Bioinformatics Group

On 6/7/11 1:28 PM, Ken Weiss wrote:
> I understand that to make each item in a custom track have its own
> user-determined color (e.g., SNPs color-coded by minor allele frequency) one
> needs to set itemRgb to on.  But is it 'itemRgb=on', or must it have quotes
> and/or capitalization as in itemRgb="On" ?
>
> Also since color is the 5th (or so) possible BED field, I understand that
> the other fields need to be filled in.  But sometimes there is no data or no
> sense in these fields (such as strand +/-).  Is it correct that you just put
> in some place-holding values here?
>
> If that's the case, then I'd suggest a modification to the BED specs, so
> that fields on doesn't want to use could be specified by * or something
> rather than by guessing at what would hold the places but not affect the
> track in an unwanted way.
>
> Thanks.
>
> Ken
>
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