Graphic effects - Feather Edges of Rects

[Howard Bornstein]

On Wed, Feb 3, 2016 at 9:45 PM, Terry Judd <terry.judd at unimelb.edu.au>
wrote:

> OK, what about thisŠ
>
> Transparent (non opaque) graphic object with a 1 pixel linesize. Apply an
> outer glow - this will display equally on either side of the border. Then
> alter the border colour to match the glow where it adjoins the border. The
> border Œdisappears¹ but it may or may not simulate the effect you are
> looking for.
>

This is exactly what I did and it works pretty well. Unfortunately, while
it works fine for creating a feathered rectangle (or oval), it doesn't
really work for feathering an image, because you don't want the glow to be
on the inside of the image.

>
> Terry...
>
> On 4/02/2016 3:44 pm, "use-livecode on behalf of Scott Rossi"
> <use-livecode-bounces at lists.runrev.com on behalf of
> scott at tactilemedia.com> wrote:
>
> >The way one *should* be able to do this is using the innerGlow effect.
> >However, by itself, using the basic setting is not strong enough, and the
> >spread effect is backwards (increases outward, rather than inward -- bug)
> >so that's useless.
> >
> >You can achieve a feather effect using multiple objects stacked on top of
> >each other, but then you have to ask is that worth doing.  If you have to
> >do anything with the set of objects, such as move it around or scale it,
> >then the effect is probably too much trouble, especially on mobile.
> >
> >You can create a feather effect by grouping the source image with a mask
> >image that contains a painted rectangular inner glow effect.  If you set
> >the centerRect of the mask image to appropriate dimensions (the radius of
> >glow at each corner of the image), you can resize the group and keep the
> >glow effect intact with no loss of quality.
> >
> >FYI, you can create a transparent graphic with innerGlow using an ink
> >effect.  For example, set the backColor of the graphic to black, apply a
> >white innerGlow (255 opacity), and set the ink of the graphic to
> >blendScreen.  This will make all black in the graphic transparent while
> >keeping the white intact.  But again, the innerGlow is fairly weak.
> >
> >Regards,
> >
> >Scott Rossi
> >Creative Director
> >Tactile Media, UX/UI Design
> >
> >
> >
> >
> >On 2/3/16, 7:38 PM, "use-livecode on behalf of Howard Bornstein"
> ><use-livecode-bounces at lists.runrev.com on behalf of
> >bornstein at designeq.com> wrote:
> >
> >>Yes this is true and understood. However, I've been working with
> >>Brahmanathswami to find a solution for a transparent object because, as
> >>he
> >>says, "Any inner glow or outer glow leaves a sharp edge on the object no
> >>matter what we do." (with an opaque object)
> >>
> >>He was looking for a way to feather images within LC and an opaque
> >>graphic
> >>object won't do that (as far as I can tell).
> >>
> >>On Wed, Feb 3, 2016 at 5:19 PM, Terry Judd <terry.judd at unimelb.edu.au>
> >>wrote:
> >>
> >>> Hi Howard - the outerglow (and innerglow) of an object display fine for
> >>>me
> >>> on both a field and an (and this bit is important) *opaque* graphic
> >>>object
> >>> when their borderWidth and lineSize properties are respectively set to
> >>>0.
> >>>
> >>> Terry...
> >>>
> >>> On 4/02/2016 11:26 am, "use-livecode on behalf of Howard Bornstein"
> >>> <use-livecode-bounces at lists.runrev.com on behalf of
> >>> bornstein at designeq.com> wrote:
> >>>
> >>> >As did I. What happened when you set the linesize to 0?
> >>> >
> >>> >On Mon, Feb 1, 2016 at 12:42 PM, Devin Asay <devin_asay at byu.edu>
> >>>wrote:
> >>> >
> >>> >>
> >>> >> > On Feb 1, 2016, at 11:53 AM, Howard Bornstein
> >>><bornstein at designeq.com
> >>> >
> >>> >> wrote:
> >>> >> >
> >>> >> > If you set the line size to 0, the outer glow disappears.
> >>> >>
> >>> >> For what kind of object? I tested it on a graphic object.
> >>> >>
> >>> >> Devin
> >>> >>
> >>> >> Devin Asay
> >>> >> Office of Digital Humanities
> >>> >> Brigham Young University
> >>> >>
> >>> >>
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> >>> >
> >>> >
> >>> >
> >>> >--
> >>> >Regards,
> >>> >
> >>> >Howard Bornstein
> >>> >-----------------------
> >>> >www.designeq.com
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> >>
> >>
> >>
> >>--
> >>Regards,
> >>
> >>Howard Bornstein
> >>-----------------------
> >>www.designeq.com
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-- 
Regards,

Howard Bornstein
-----------------------
www.designeq.com