I don't completely follow what you're saying. However, I'd really strongly suggest that you not use this background image. There is simply too much color and it overloads the whole dashboard. If you feel strongly about using an image, then I'd suggest dulling the colors somewhat so that it goes into the background a bit. For example, I took the image, applied a sepia filter, then made it a bit darker. In my opinion, it is much easier to read now. Just my two cents.
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Thank you for the suggestion, I think I will put that to use here. A few more questions if you dont mind.
First let me try to clarify my previous question. In the images that I shared there are two charts (obvious I know) in one chart the black background @ 25% opacity extends "low" enough that I was able to place a text box over it so the text was easier to read. Does that make it more clear?
Secondly were you able to apply that filter within Tableau or did you use some other third party softwaret o adjust the image and then re-apply it in tableau?
I think I understand. It looks like the Fit settings on your charts are different. One is set to Fit Width, which will allow you to make the chart larger vertically, without the bars actually growing. The other is set to Entire View, which will make the bars grow. Try setting them both to Fit Width and I think you'll get what you need.
To modify the image, I used a free tool called Paint.net (you can get it here: https://www.getpaint.net/). The animated gif below shows what I did with the image.