Can GIMP export in tif format without aplha channel?

[ajax]

(02-17-2020, 08:04 AM)Ofnuts Wrote: ...

The file created with RT doesn't help. If the file is too big use a smaller image.

• Created a 100x100 image (10000px) without an alpha channel. Filled with "Plasma".
  
• Export as TIFF, no compression , all default settings, except skipped the thumbnail.
  
• Exported TIFF is 30990 bytes (so roughly 3 bytes/pixel)
  
• Layer>Transparency>Add alpha channel
  
• Export as TIFF, no compression , all default settings, except skipped the thumbnail.
  
• Exported TIFF is 41007 bytes (so roughly 4 bytes/pixel)
  

Do you get an alpha channel in Gimp if you open the Tiff-noAlpha one?

OK!  Working with your files I think I've discovered the cause as follows:

• When I open Tiff-noAlpha.tif there is NO alpha channel.
  
• When I export Tiff-noAlpha.tif without unchecking Save Layers there is NO alpha channel.
  
• When I export Tiff-noAlpha.tif with Save Layers unchecked there is an alpha channel.
  

To be honest I can't explain why I don't want layers saved other than it sounds like something extra that I can't explain why I would want it.  In this case extra means extra size (storage space).  So it now looks like my intention of making the file smaller actually has the opposite affect of making it larger.

Looks like it would be good for me to learn the purpose of Save Layers.  Any suggestions?  How about reference documentation?

Thanks for your help!