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A quick question about TIF mask files

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Posted

I use Gimp for my graphics work rather than Photoshop which introduces a few little differences for me when I work through the tutorial. Most I have been able to nut my way through but the mask files cause me a little confusion.

If I save the TIFs as per the tutorial I have only the 'W' or 'B' layer visible (so not the background _su layer) and select "merge visible layers" as I save. This gives me TIF files with the area I masked in the water colour in the water mask and black in the blend mask, and the rest transparent (light & dark grey squares in Gimp the same as in Photoshop if my ageing memory is right). Should those areas be white as per the turorial pictures or transparent? Should I add a visible pure white layer under my mask layer?

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Posted

I use Gimp for my graphics work rather than Photoshop which introduces a few little differences for me when I work through the tutorial. Most I have been able to nut my way through but the mask files cause me a little confusion.

If I save the TIFs as per the tutorial I have only the 'W' or 'B' layer visible (so not the background _su layer) and select "merge visible layers" as I save. This gives me TIF files with the area I masked in the water colour in the water mask and black in the blend mask, and the rest transparent (light & dark grey squares in Gimp the same as in Photoshop if my ageing memory is right). Should those areas be white as per the turorial pictures or transparent? Should I add a visible pure white layer under my mask layer?

The transparent areas should be made pure white 255,255,255

Sometimes your water areas need to be darkened to do their job, too.

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Posted

Thanks. That's what expected would be the case.

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Posted

Hey mate I use GIMP for all my stuff too. To get a tif file I use the path tool and select my outline then use the layer menu, add layer masl, from selection. This will add a layer with the mask, then select the image menu and flatten image this should leave the previosuly grey and white check bit a single colour usually white or black you can bucket fill as appropriate. Then i invert the selection and add a layer mask for the remainder and then again flatten image and fill with appropriate colour - might be other better ways but works 4 me

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Posted

Problem solved!

I just created a new transparent layer then did the lasso selection of my blend area, inverted it and filled with black (making sure the new layer was selected in the layer dialog). Then I created a 2nd white layer, placed it behind the mask layer and flattened. That did the job nicely!

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Posted

Yep Wirraway, I think that's the best way to do it.

When using the polygonal lasso tool, if you're applying a feather to soften the edges - do it BEFORE you invert the selection.

Otherwise you may get breakthrough around the edge of your tile (which you probably won't notice until you test the compiled BGL)

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