problem integrating manually BIAS frames

[hectorbdn]

Hello, I'm trying to do manual integration of BIAS frames as Warren Keller's book explains but my results are that a part of the image is empty, what I'm doing wrong?

[jkmorse]

A couple of things.  What do your individual bias frames look like?  Is this an issue before you integrate?  If not, try unchecking the "clip lower range" setting and see what happens.

[Greg Schwimer]

Is this a DSLR camera? If so, which one? If it is...

I've seen this before with DSLR data. First, be sure that you are capturing in RAW mode only. Under View->Explorer Windows select Format Explorer. This will open it at the left if it isn't there already. Open that tab and select DSLR_RAW. At the bottom right of that window select Edit Preferences. Make sure the "No Image Flip" option is checked. You might also want to check the Pure Raw button at the bottom, but make sure it's the right setting for your camera.

[hectorbdn]

A couple of things.  What do your individual bias frames look like?  Is this an issue before you integrate?  If not, try unchecking the "clip lower range" setting and see what happens.

Is this a DSLR camera? If so, which one? If it is...

I've seen this before with DSLR data. First, be sure that you are capturing in RAW mode only. Under View->Explorer Windows select Format Explorer. This will open it at the left if it isn't there already. Open that tab and select DSLR_RAW. At the bottom right of that window select Edit Preferences. Make sure the "No Image Flip" option is checked. You might also want to check the Pure Raw button at the bottom, but make sure it's the right setting for your camera.

thanks pals! I will give it a try and report back   , yes it is a Canon 550D modified and cooled, No bias frame looks like that before stacking