Extracting

M
Posted By
MrsBeebleBrock
Oct 21, 2003
Views
320
Replies
6
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Closed
Hi, are there any tips for when you are given photos of grey items which have been photographed against a white background, whose shadows are the same grey as the images you are trying to extract?

The extract filter does a nice job on most of the images, but some edges are transparent and the clean up tools are only available until you hit "okay" – eg before you’ve seen the results.

Thanks in advance for any advice.

Jo
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F
Frogiswrong
Oct 21, 2003
try duplicating a channel and changing the contrast of it till a difference is noticed between the areas you need and dont need then use this corrected channel to make a mask.

"MrsBeebleBrock" wrote in message
Hi, are there any tips for when you are given photos of grey items which have been photographed against a white background, whose shadows are the same grey as the images you are trying to extract?

The extract filter does a nice job on most of the images, but some edges are transparent and the clean up tools are only available until you hit "okay" – eg before you’ve seen the results.

Thanks in advance for any advice.

Jo
M
MrsBeebleBrock
Oct 21, 2003
Hmm. Okay, I’ll have a look in the help files about duplicating channels. Thanks for the suggestion.
Jo

Frogiswrong wrote:
try duplicating a channel and changing the contrast of it till a difference is noticed between the areas you need and dont need then use this corrected channel to make a mask.

"MrsBeebleBrock" wrote in message

Hi, are there any tips for when you are given photos of grey items which have been photographed against a white background, whose shadows are the same grey as the images you are trying to extract?

The extract filter does a nice job on most of the images, but some edges are transparent and the clean up tools are only available until you hit "okay" – eg before you’ve seen the results.

Thanks in advance for any advice.

Jo

S
Skip
Oct 21, 2003
Jo
After you fill your selection with the paint bucket, Click on "preview" instead of "OK"

Hope this helps

Kev
M
MrsBeebleBrock
Oct 21, 2003
Hi Kev, yes, that combined with the shift key to highlight in a straight line helps. It’s still a difficult thing to master though.

I also have Corel Knockout but that’s even more mystifying.

Thanks,
Jo

Skip wrote:
Jo
After you fill your selection with the paint bucket, Click on "preview" instead of "OK"

Hope this helps

Kev

S
Skip
Oct 21, 2003
Jo

I have knockout 2 but I need help with that………lol
When using Extract I change the backgrounds…….transparent….white and black to see which helps best. Don’t forget the alt. key for reversing the effects.

Kev
M
MrsBeebleBrock
Oct 22, 2003
Hi Kev, Knockout 1.5 has really dodgy help files. And the tutorials leave out crucial bits of information. Sounds like 2 is no easier to learn.

Jo

Skip wrote:
Jo

I have knockout 2 but I need help with that………lol
When using Extract I change the backgrounds…….transparent….white and black to see which helps best. Don’t forget the alt. key for reversing the effects.

Kev

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