Bias frames not stacking

[smr]

I'm trying to use bias frames from another imaging session and when I load them into DSS for some reason they are importing in a different size. But if I check the bias frames in Lightroom and by details in the properties for the image they are 6000x4000 pixels.

In DSS they are coming in as 6288x4056. I have tried exporting them as TIFF and 6000x4000 pixels but that doesn't work. DSS says it cannot stack them because they are a different size. Any ideas?

 

edit - it's ok i've sorted it now, had to use the original bias frames, load them in LR, then export as TIFF. Sure I tried this already and it didn't work but hey ho.

[PeterCPC]

Looks like you are mixing TIFF and RAW images.

Peter