editing transparency

[Torvin]

let's say i've somehow changed the transparency of some pixels on a layer (e.g. by using an eraser or applying a mask) and now these pixels, let's say, 50% transparent.
now, how do i make them, let's say, 20% transparent (80% opaque)? with tools like masks or eraser i can only make them more transparent, but i need less...

UPD: see solution on the page 3: editing transparency

[Nomission]

If you paint black in the layer mask, you get opacity 0%, with white, opacity 100%.
Any grey level between, gives the correspondent amount of transparency.
Hope it helped...

[Torvin]

yes, i know that. but what should i do if mask's been already applied and deleted?

[Nomission]

And why would you do that?

[Torvin]

that doesn't matter. consider i changed the transparency of pixels using eraser, not mask

[Nomission]

Ok, eraser set pixel information. If you use it at 100% opacity it simply clears those affected pixels and once gone...they're gone.(that's why we use masks, because they are "summed" with the actual pixels)
This also aplies to any "degree" of erasing...

[Torvin]

Ok, eraser set pixel information.

it does. and that's what i am asking!
how to CHANGE the pixel information?
it would be great if i could edit transparency as a separate channel (don't offer me to create it. i ALREADY have semi-transparent image - now i want to edit it!)

[Nomission]

I use a trick I developed myself, to get opacity back.
In a presence of a semi-transparent image (with no alpha channel available), I paste it repeatdly over itself. Eventually the sum of the semi-transparent pixels will turn them opaque.
Don't expect great results on drop shadows and the like, because it will destroy them.

[rangaraj1987]

Often of the times (all of the times at my knowledge) the texture is in the courts .fsh files. You could try to edit the pwod-file (I think it's that file that you have in you picture there) in the courts xxxcrt_vra.fsh-file to transparent.
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[Torvin]

I use a trick I developed myself, to get opacity back.

well, i use the same here i was hoping to find something more useful. but thanks anyway..
looks like photoshop does not allow editing transparency channel... that seems strange to me, because more simple (and free) graphic editors often have this feature..

@rangaraj1987: i have no idea what are you talking about