A tale of crustaceans and critters ,
introduced an army of frogs that began with a border chart 
the 27X83 PNG 
in half drop, 81X83
There is often a resistance to swatching. One of the benefits of large enough tests, even when gauge is not a factor, is to find that, as in this case, color separated for DBJ, knit in birdseye backing, well, look at this!
The color reversal seen at the top of the repeat, as return is made to the first row of the design, can be caused by making an error in changing colors appropriately. There is no evidence of that on the reverse; striping would be wider in areas where either color was carried for 4 rows.
If the planned design is to be used as a continuous pattern, with a return to row 1 after reaching its top, when knitting DBJ, the designs must be an even number of rows in height to start with.
Tools or built-in functions that automate conversions do not always provide error warnings.
Another go at the frogs: 27X84
in half drop, 54X84
The GIMP script color separation, 54X168
Color, and technique choices, and whether they are deemed successful or not, are determined by personal preference. Here, a space dyed thin cotton was plied with a white yarn as the light color.
The frog at the top of the repeat is no longer beheaded.
There is a snag around that area, however, that causes slight distortion, noticeable on both sides. 
Some notes on machine knitting color changers review their use.
The snags in the swatch were from the space dyed yarn getting picked up with the green/ dark ground.
That can happen from the ribber arm needing a minor adjustment, not clearing the color changer far enough (there is an audible click at that time), or, in this case, the thin yarn was snagging around the guide for the adjacent #2 dark color and getting picked up with it. 
Historical blog posts on DBJ can be found in the blog index
Keeping machines clean and oiled, along with balancing the ribber, aids in error-free stitch formation.
Always something new to learn, lili buttons will not rotate if the carriage is set with the slip levers in the up position.