Hey,
I have the following problem: using the `karyoploteR` package in R, i want to plot chromatin configuration along the genome as a colored bar. The GRanges Object with the chromatin regions has a column for that ("V9") with rgb values associated with each region. However, the `kpPlotRegions` function requires the colors in hex-format. I tried to export the Object, change rgb to hex and re-import it, but doesn't recognize the input. Has anyone experienced this problem or could provide a solution? Thank you!

    > K562.hmm
    GRanges object with 622257 ranges and 6 metadata columns:
             seqnames              ranges strand |                V4        V5
                <Rle>           <IRanges>  <Rle> |       <character> <integer>
           1     chr1         10000-10600      * | 15_Repetitive/CNV         0
           2     chr1         10600-10937      * | 13_Heterochrom/lo         0
           3     chr1         10937-11937      * |       8_Insulator         0
           4     chr1         11937-12337      * | 5_Strong_Enhancer         0
           5     chr1         12337-13137      * |   7_Weak_Enhancer         0
         ...      ...                 ...    ... .               ...       ...
      622253     chrX 155256806-155257806      * |       11_Weak_Txn         0
      622254     chrX 155257806-155259206      * |       8_Insulator         0
      622255     chrX 155259206-155259406      * |   6_Weak_Enhancer         0
      622256     chrX 155259406-155259606      * |   7_Weak_Enhancer         0
      622257     chrX 155259606-155260406      * | 15_Repetitive/CNV         0
                      V6        V7        V8          V9
             <character> <integer> <integer> <character>
           1           .     10000     10600 245,245,245
           2           .     10600     10937 245,245,245
           3           .     10937     11937  10,190,254
           4           .     11937     12337   250,202,0
           5           .     12337     13137   255,252,4
         ...         ...       ...       ...         ...
      622253           . 155256806 155257806 153,255,102
      622254           . 155257806 155259206  10,190,254
      622255           . 155259206 155259406   255,252,4
      622256           . 155259406 155259606   255,252,4
      622257           . 155259606 155260406 245,245,245
      -------
      seqinfo: 23 sequences from an unspecified genome; no seqlengths
    > kpPlotRegions(kp, K562.hmm, col=K562.hmm$V9, r0=0.22, r1=0.3)
    Error in (function (xleft, ybottom, xright, ytop, density = NULL, angle = 45,  : 
    Unzulässige Farbspezifikation "245,245,245"
  
The rgb conversion shown [here](https://stackoverflow.com/questions/31574480/rgb-to-hex-converter) should help. I.e. 

```
sapply(strsplit(K562.hmm$V9, ","), function(x)
    rgb(x[1], x[2], x[3], maxColorValue=255))
```