Considering that transparency and opacity are opposites, yes. Something completely transparent is not at all opaque, and something completely opaque is not at all transparent. However, something which is 50% transparent is also 50% opaque, and something 25% transparent would be 75% opaque, and something 25% opaque would be 75% transparent.
Transparency and opacity are at the opposite ends of the same scale.
opacity slider on layers palette
Opacity is the transparency of your layer that is featured. It is useful for safe editing in Photoshop, opacity is used to 'dim down' a certain object and is commonly used in masking to see layers behind the layer that uses opacity. Higher opacity will make the layer more opaque. Lower opacity will make the layer more transparent. Hope this helps :)
put each photo on a differnet layer with the top photo the one you want to be transparent - then use the opacity slider in the layers pallet to adjust amount of transparency (or opacity) on the top photo layer - 50% is an equal blend of both photos and 100% is no transparency - make sure the you have the correct layer selected when adjusting opacity (the top one)
transparency
You can create new blank layer which is transparent by clicking Create a new layer (page) icon in LAYERS palette or from Layer > New > Layer (Ctrl + Shift + N). To make existing layer transparent or with some level of transparency (0% - transparent, 100% - opaque) use Opacity slider (or type number in text field) in top right corner in LAYERS palette. Another way to make layer transparent is to remove its fill using Fill slider which is below Opacity (click triangle on right side to appear slider). Difference between this two methods which may seems to you as exactly the same is because Photoshop does not treat layer effect as layer fill so you can for example add Drop Shadow layer effect to an object (circle for example) and setting Fill to 0% will remove object fill (will make it invisible) but drop shadow will still be visible, on the other hand setting Opacity to 0% will hide (make transparent) and object and layer effect.
The opacity determines how transparent a layer in Photoshop is. Setting the opacity at 0% will make the layer completely invisible, revealing any layers underneath it. Setting the opacity at 50% will make the layer half visible, making both the layer, and the layers under it equally visible. Setting the opacity to 100% will make the layer completely visible, anything under it will be completely covered. This can be useful when changing eye colors, as if the color you've changed the eye to looks too unrealistic, you can lower the opacity to allow the original eye color and detail to show through, which can make for a more realistic effect.
Opacity affects everything on layer including layer effects while Fill does not affect layer effects applied. For more details and explanation visit link from related links section below this answer,
To adjust the RGB alpha settings in After Effects for transparent layers, you can use the Opacity property in the Layers panel. Set the opacity value to less than 100 to make the layer transparent. You can also use the Fill effect to adjust the transparency further if needed.
An example of degree of transparency would be the percentage of a window that allows light to pass through it. Another example could be the opacity level of a document where higher transparency means more see-through.
It not capacity it OPACITY. Opacity is the control of how visible the layer or action of the tool is i.e lowering the opacity of the brush makes the line drawn seem more transparent
Opacity slider controls how much is visible of layer content. 100% is everything visible, 0% nothing visible, 50% you can see through.
Select layer you want to make transparent, then in top right corner of Layers panel type 0 in text field next to Opacity, or click triangle on right side of Opacity to expand slider and drag it to the left till you see 0%. Every new blank layer created in Photoshop is also transparent (Layer > New > Layer...).