Re: [NTG-context] blurred shadow on images?
Am 2010-06-30 um 22:47 schrieb Wolfgang Schuster:
You can change the boundingbox in the metapost graphic (the white
background was required
for the cow figure because it has a transparent background)
Thank you! I used an opaque picture for my tests.
I played a bit with different shapes, I like my rounded rectangle best:
\startuniqueMPgraphic{mpshadow}
ox := -7 ; % offset x
oy := -7 ; % offset y
bx := 5 ; % bleed x
by := 5 ; % bleed y
rx := 7 ; % corner radius x
ry := 7 ; % corner radius y
for dx = 0 upto 40:
dy := dx ;
xa := dx + ox - bx/2;
xb := \overlaywidth - dx + ox + bx/2;
ya := dy + oy - by/2;
yb := \overlayheight - dy + oy + by/2;
% % rectangle
% fill (xa,ya)--(xb,ya)--(xb,yb)--(xa,yb)--cycle
% withcolor transparent(normal, .04, black) ;
% rounded rectangle
fill (xa, ya + ry)---
(xa, yb - ry)..
(xa + rx, yb)---
(xb - rx, yb)..
(xb, yb - ry)---
(xb, ya + ry)..
(xb - rx, ya)---
(xa + rx, ya)..cycle
withcolor transparent(normal, .04, black) ;
% % super ellipse
% hx := xb / 2;
% hy := yb / 2;
% fill (xa + rx, ya + ry)...
% (xa, ya + hy)...
% (xa + rx, yb - ry)...
% (xa + hx, yb)...
% (xb - rx, yb - ry)...
% (xb, ya + hy)...
% (xb - rx, ya + ry)...
% (xa + hx, ya)...cycle
% withcolor transparent(normal, .04, black) ;
endfor;
setbounds currentpicture to OverlayBox ;
\stopuniqueMPgraphic
\defineoverlay[shadow][\useMPgraphic{mpshadow}]
\starttext
\rotate[rotation=12]{%
\externalfigure[koe][width=50mm,background=shadow]
}
\stoptext
Greetlings from Lake Constance!
Hraban
---
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http://wiki.contextgarden.net
https://www.cacert.org (I'm an assurer)
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Re: [NTG-context] blurred shadow on images?
Am 2010-06-21 um 08:42 schrieb Taco Hoekwater:
Creating a semi-transparent backdrop with metapost is quite simple,
but I am not sure whether that works with cmyk, you'll have to try
yourself. Code goes something like this:
For the records: This is, how I'll use it:
\startuniqueMPgraphic{texthole}
for dx = 0 upto 40:
dy := dx;
wa := 10 + dx;
wb := \overlaywidth - dx - 10;
ha := dy + 10;
hb := \overlayheight - dy - 10;
fill (wa,ha)--(wb,ha)--(wb,hb)--(wa,hb)--cycle
withcolor transparent(normal, .04, black);
endfor;
\stopuniqueMPgraphic
\defineoverlay[shaded][\useMPgraphic{texthole}]
\starttext
\rotate[rotation=12]{%
\framed[height=50mm, width=50mm, frame=off, background=shaded,
backgroundoffset=5mm, align=middle]%
{\offset[x=1mm,y=-2mm]{\externalfigure[koe][width=50mm]}}%
}
\stoptext
I'm glad I found \offset, because framed's offset parameter can't
distinguish x and y offset.
Positive offset moves right and down, negative offset moves just up -
I guess that's a buglet.
Greetlings from Lake Constance!
Hraban
---
http://www.fiee.net/texnique/
http://wiki.contextgarden.net
https://www.cacert.org (I'm an assurer)
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Re: [NTG-context] blurred shadow on images?
Am 30.06.10 14:39, schrieb Henning Hraban Ramm:
Am 2010-06-21 um 08:42 schrieb Taco Hoekwater:
Creating a semi-transparent backdrop with metapost is quite simple,
but I am not sure whether that works with cmyk, you'll have to try
yourself. Code goes something like this:
For the records: This is, how I'll use it:
\startuniqueMPgraphic{texthole}
for dx = 0 upto 40:
dy := dx;
wa := 10 + dx;
wb := \overlaywidth - dx - 10;
ha := dy + 10;
hb := \overlayheight - dy - 10;
fill (wa,ha)--(wb,ha)--(wb,hb)--(wa,hb)--cycle
withcolor transparent(normal, .04, black);
endfor;
\stopuniqueMPgraphic
\defineoverlay[shaded][\useMPgraphic{texthole}]
\starttext
\rotate[rotation=12]{%
\framed[height=50mm, width=50mm, frame=off, background=shaded,
backgroundoffset=5mm, align=middle]%
{\offset[x=1mm,y=-2mm]{\externalfigure[koe][width=50mm]}}%
}
\stoptext
I'm glad I found \offset, because framed's offset parameter can't
distinguish x and y offset.
Positive offset moves right and down, negative offset moves just up -
I guess that's a buglet.
You can change the boundingbox in the metapost graphic (the white
background was required
for the cow figure because it has a transparent background)
\startuniqueMPgraphic{shadow}
for dx = 0 upto 40:
dy := dx ;
wa := dx - 10 ;
wb := \overlaywidth - dx + 10 ;
ha := dy - 10 ;
hb := \overlayheight - dy + 10 ;
fill (wa,ha)--(wb,ha)--(wb,hb)--(wa,hb)--cycle
withcolor transparent(normal, .04, black);
endfor;
setbounds currentpicture to OverlayBox ;
\stopuniqueMPgraphic
\defineoverlay[shadow][\useMPgraphic{shadow}]
\starttext
\externalfigure[cow][width=50mm,background={shadow,color},backgroundcolor=white]
\stoptext
Wolfgang
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Re: [NTG-context] blurred shadow on images?
Am 2010-06-21 um 08:42 schrieb Taco Hoekwater: Henning Hraban Ramm wrote: I'd like to place some plain photos rotated (say 12°) and with a blurred shadow above some colored elements, i.e. the shadow must use transparency. I guess I could get such using ImageMagick, but is there a possibility using ConTeXt or one of its favourite friends? I'd prefer a solution that works with CMYK data. Creating a semi-transparent backdrop with metapost is quite simple, but I am not sure whether that works with cmyk, you'll have to try yourself. Code goes something like this: Thank you, I'll try. Seems like I should learn MetaPost finally... If there isn't - is the transparency of PNG usable? Sure, and may use less resources than mp drawings, but that is definitely RGB Yes, of course. Since I only need to output on a color laser printer, it will probably work. Processing time matters. Greetlings from Lake Constance! Hraban --- http://www.fiee.net/texnique/ http://wiki.contextgarden.net https://www.cacert.org (I'm an assurer) ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] blurred shadow on images?
Henning Hraban Ramm wrote:
I'd like to place some plain photos rotated (say 12°) and with a blurred
shadow above some colored elements, i.e. the shadow must use transparency.
I guess I could get such using ImageMagick, but is there a possibility
using ConTeXt or one of its favourite friends?
I'd prefer a solution that works with CMYK data.
Creating a semi-transparent backdrop with metapost is quite simple,
but I am not sure whether that works with cmyk, you'll have to try
yourself. Code goes something like this:
\startuniqueMPgraphic{texthole}
for dx = 0 upto 40:
dy := dx;
wa := 10 + dx;
wb := \overlaywidth - dx - 10;
ha := dy + 10;
hb := \overlayheight - dy - 10;
fill (wa,ha)--(wb,ha)--(wb,hb)--(wa,hb)--cycle
withcolor transparent(normal, .04,white);
endfor;
\stopuniqueMPgraphic
If there isn't - is the transparency of PNG usable?
Sure, and may use less resources than mp drawings, but that is
definitely RGB
Best wishes,
Taco
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[NTG-context] blurred shadow on images?
I'd like to place some plain photos rotated (say 12°) and with a blurred shadow above some colored elements, i.e. the shadow must use transparency. I guess I could get such using ImageMagick, but is there a possibility using ConTeXt or one of its favourite friends? I'd prefer a solution that works with CMYK data. If there isn't - is the transparency of PNG usable? Since all of the pictures will have almost the same size, I could probably also use the shadow as a single PDF picture and place that behind with a small offset. Greetlings from Lake Constance! Hraban --- http://www.fiee.net/texnique/ http://wiki.contextgarden.net https://www.cacert.org (I'm an assurer) ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
