# Get color channel data for each blob
**URL:** https://forums.openmv.io/t/get-color-channel-data-for-each-blob/6251
**Category:** OpenMV Boards
**Created:** [August 23, 2021, 7:31am UTC](https://forums.openmv.io/t/get-color-channel-data-for-each-blob/6251 "2021-08-23T07:31:48Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@darrask](https://forums.openmv.io/u/darrask)
#### Post date: [August 23, 2021, 7:31am UTC](https://forums.openmv.io/t/get-color-channel-data-for-each-blob/6251/1 "2021-08-23T07:31:48Z")
I am using find\_blobs to detect and log blobs:
> img.find\_blobs([(0, 3), (-3, 3),(-3, 3)],invert = True, merge = True, pixels\_threshold = 100)
Apart from the usual statistics like elongation, number of pixels, etc. I would like to extract statistics about the Lab color channels. I was thinking that I should set the x\_ or y\_hist\_bis\_max to some integer value above 0 but then I do not know how to access that information (I tried calling “histogram()” on the blob, or accessing its blob.x\_histogram() attribute, etc.).
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### Author:  [@kwagyeman](https://forums.openmv.io/u/kwagyeman)
#### Post date: [August 23, 2021, 4:29pm UTC](https://forums.openmv.io/t/get-color-channel-data-for-each-blob/6251/2 "2021-08-23T16:29:32Z")
You just do: [image — machine vision — MicroPython 1.15 documentation](https://docs.openmv.io/library/omv.image.html?highlight=histogram#image.image.blob.blob.x_hist_bins)
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### Author:  [@kwagyeman](https://forums.openmv.io/u/kwagyeman)
#### Post date: [August 23, 2021, 4:30pm UTC](https://forums.openmv.io/t/get-color-channel-data-for-each-blob/6251/3 "2021-08-23T16:30:00Z")
The histogram is a list of integers.
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### Author:  [@darrask](https://forums.openmv.io/u/darrask)
#### Post date: [August 24, 2021, 7:57am UTC](https://forums.openmv.io/t/get-color-channel-data-for-each-blob/6251/4 "2021-08-24T07:57:51Z")
thanks! I did not check properly it seems, and now I got it to work and output the list of integers.
However: would this be a histogram of the “L” channel in Lab space? How do I get the info for each color channel?
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### Author:  [@kwagyeman](https://forums.openmv.io/u/kwagyeman)
#### Post date: [August 24, 2021, 4:25pm UTC](https://forums.openmv.io/t/get-color-channel-data-for-each-blob/6251/5 "2021-08-24T16:25:17Z")
No, it’s a histogram of the binary mask of the object. It’s meant to be a descriptor that you can use to match binary patterns.
You want to use get\_histogram() with the roi= and threshold= arguments set on a blob location to get the histogram of the color channels.
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### Author:  [@darrask](https://forums.openmv.io/u/darrask)
#### Post date: [August 25, 2021, 4:15am UTC](https://forums.openmv.io/t/get-color-channel-data-for-each-blob/6251/6 "2021-08-25T04:15:05Z")
Thanks Kwabena, you set me on the right path! Following the documentaiton, I then used get\_statistics() with the roi = blob.rect and thresholds equal to the same values that I use in find.blobs() to get the LAB channels’ mode, min, and max values.