The anti aliasing control-group
determines the strength of the anti aliasing, not how much will
be filtered. The amount of pixels - and which - selected for filtering
is determined by the plug ins second group of filter-controls "Jaggie
Max trail-off size
This determines how far the anti aliasing may (not "will") span. Along nearly vertical or horizontal edges or curves you will typically want a longer trail-off for a smoother impression, so this is what the plugin will give you. Where the jaggie-step is one to one (45º) the trail-off will never be more than one pixel. The trail-off will change according to the curve or direction of the object. This ensures smooth edges with minimum blurring. (See illustration below).
1. To preserve some crispness set max trail-off low.
2. To ensure symmetric anti aliasing in concave areas, like the
inside of a U (see below), you might want to set the max trail-off
size to half the size of the area. If f.ex. the lowermost white
at the inside of the U is 6 pixels wide, the best trail-off size
to preserve perfect symmetry is 3. In most cases this does not matter
much since the asymmetry will be unnoticeable, but the option is
3. Size 3 - 6 are the most useful for general purposes.
Max trail-off size
you write text in Photoshop, you already have a superb anti aliasing,
but as you will know it only works for text - and only for text
written in Photoshop. If you scan text or graphics (or make cutout
text, like we did with the word "rainforest" above) you
will need a separate anti aliasing filter. Since the effect of anti aliasing
letters is well known, we will illustrate our principle with the
lower part of an O.
Before anti aliasing.
- It's the bottom of a plain "0"
Anti aliased with Max trail-off size 1
This is too low for optimum result.
Anti aliased with Max trail-off size 3
This is the right size in this case.
had to send a letter abroad and received a letter from the translator.
However it did not look nice when we scanned it. Here's the word
"e-mail" scanned - before and after being anti aliased
100% at trail-off size 2. For illustration we used the same unaliased
type for the word "Antialiased" as for "raw scan"
and applied our plugin to that at the same time.
The "Jaggie definition" control-group - Tune the anti aliasing filter
group of controls is most useful when anti aliasing jaggies (jagged
edges) within images. It is not so relevant for Black/White situations
like the above text with clear cut edges.
Power Retouche anti aliasing filter for anti aliasing jaggies (jagged edges). Anti alias graphics and text with our anti alias filter (Photoshop plugin). Remove those nasty jagged edges.
uses the PowerRetouche edge-detection to determine if the adjacent
pixels are an edge or not. If not an edge of some sort, there is
probably no point in anti aliasing it.
is more complex than edge-detection. It will analyze the pixels
and evaluate if they form a jag. The higher the settings, the more
will be included.
Show changed pixels
Enable this checkbox to display a mask on all changed pixels in the preview. It will not be included in the output.
This helps set the Edge and Jag sliders correctly and also gives a clear impression of where the plugin does something - and hence what it does.
Click on the colored rectangle to change the color of the mask.
Power Retouche anti aliasing filter for anti aliasing jaggies (jagged edges). Anti alias graphics and text with our anti alias filter (Photoshop plugin). Remove those nasty jagged edges. Power Retouche anti aliasing filter for anti aliasing jaggies (jagged edges). Anti alias graphics and text with our anti alias filter (Photoshop plugin). Remove those nasty jagged edges. Power Retouche anti aliasing filter for anti aliasing jaggies (jagged edges). Anti alias graphics and text with our anti alias filter (Photoshop plugin). Remove those nasty jagged edges.
Transparent edges only
This will only be enabled if you are working in layers. Use it if you have a layer with a cut out object surrounded by transparency. Such objects and masks are f.ex. created if you make a selection, copy it and paste it in a new layer. It can also be made with the transparency editor for masking. Checking this option will anti alias the edges between opaque and transparent, but will otherwise not anti alias the opaque object nor the transparent pixels. It will only alias the opaque edges bordering on transparency. This is an ideal partner with the Powerretouche Transparency Editor.
Example of Transparent edges only
word "Rainforest" was cut out from a picture of an iguana.
To get a poor result with lots of jaggies, we did not use our plug-ins
for the next steps, but instead relied on Photoshop. We used Photoshop's
anti aliasing on the original text, but when selecting the text
and moving the selection to an other layer, the aliasing reappears.
Here's how to do it in plain Photoshop without plug-ins: First create
a new layer on top of the iguana and fill it with white. Then write
the text in black and merge the text layer with the white layer
(but not the iguana layer). Use the magic wand selection tool on
the text and then select similar to capture the entire text. The
selection was then moved from the text layer to the Iguana layer
by selecting the Iguana layer - make the above white/text layer
invisible for ease. Press ctl-C (or apple-C) to copy the text. Then
paste the selection in a new window to get a new layer with letters
only surrounded with transparency. Below you can see the result
- it was saved as a gif with transparency intact. The problem is
the text looses the anti aliasing - it's jagged. You could do the
same with far better results using the PowerRetouche Transparency
plugin because it would preserve much of Photoshop's original anti aliasing,
but here we wanted the jaggies for illustration. (Please consult
plugin tutorial on creating masks).
In this case we have to use the anti alias filters "Transparent
edges only" option, because we don't want to anti alias the
Before anti aliasing -
notice the jagged edges.
The areas surrounding
the letters are transparent,
Transparent edges only.
Anti aliased at 100%.
Max trail-off 6.
Anti aliasing entire photos
will remove the harsh appearance aliasing causes. It gives a richer
impression, softer without blur, by creating more intermediate hues
along jagged edges.
See the whole image as uncompressed TIFF here
See the whole image as uncompressed TIFF here
The above image was filtered twice. We set Effect to 100%, Edge Include to 100% and Jag Include to 100%. Max Trail-off Size was set to 2 in the first run and to 1 in the second.
The following Iguana picture was only filtered once.
Before anti aliasing
After anti aliasing
If you wish to see before and after examples of the Iguana on a large image that
is not jpeg-compressed, you can do so here.
It will open in a new window.