the wldeblend images are on different zero points, but we are not passing this on

[esheldon]

We need to pass this information to the coadding some how, or put them onto the same system

I expect that the real DM processing forces all images to have the same zero point

[beckermr]

Wait what? How are the zero points different?

[esheldon]

What's the mag zero point?

[beckermr]

The issues title says the images are on different zero points. They should not be. I use whatever flux comes out of wldeblend so the zero point should always be the same, right?

[esheldon]

Here is the formula used:

self.exposure_time*self.zero_point*10**(-0.4*(ab_magnitude-24))

The leading terms are explicitly taking the image off of the zero point of 24 and putting it onto some kind of instrumental zero point

[beckermr]

Yes but it is the same for all images, right?

Do you mean across different bands?

[esheldon]

Yes, different bands are gettinga different zero point and these are not close to 24, they range widely

[esheldon]

I plan to rescale them in the sim to zero point 30