Tk Source Code

\fBpng \-alpha\fI alphaValue\fR
.
The option has effect when reading image data from a file. Specifies
an additional alpha filtering for the overall image, which allows the
background on which the image is displayed to show through.  This
usually also has the effect of desaturating the image.  The
\fIalphaValue\fR must be between 0.0 and 1.0.
.TP
\fBsvg \-dpi\fI dpiValue\fB \-scale\fI scaleValue\fB \-unit\fI unitValue\fR
.
\fIdpiValue\fR is used in conversion between given coordinates and
screen resolution. The value must be greater than 0 and the default
value is 96.
\fIscaleValue\fR is used to scale the resulting image. The value must
be greater than 0 and the default value is 1.
\fIunitValue\fR is the unit of all coordinates in the SVG data.
Available units are px (default, coordinates in pixel), pt (1/72 inch),
pc (12 pt), mm , cm and in.
The svg format supports a wide range of SVG features, but the
full SVG standard is not available, for instance the 'text' feature
is missing and silently ignores when reading the SVG data.
The supported SVG features are:
.
.RS
\fB elements:\fR g, path, rect, circle, ellipse, line, polyline, polygon,
linearGradient, radialGradient, stop, defs, svg, style
.PP
\fB attributes:\fR width, height, viewBox,
preserveAspectRatio with none, xMin, xMid, xMax, yMin, yMid, yMax, slice
.PP
\fB gradient attributes:\fR gradientUnits with objectBoundingBox,
gradientTransform, cx, cy, r fx, fy x1, y1, x2, y2
spreadMethod with pad, reflect or repeat,
xlink:href
.PP
\fB poly attributes: \fR points
.PP
\fB line attributes: \fR x1, y1, x2, y2
.PP
\fB ellipse attributes: \fR cx, cy, rx, ry
.PP
\fB circle attributes: \fR cx, cy, r
.PP
\fB rectangle attributes: \fR x, y, width, height, rx, ry
.PP
\fB path attributes: \fR d with m, M, l, L, h, H, v, V, c, C, s, S, q, Q, t, T, a, A, z, Z
.PP
\fB style attributes: \fR display with none, visibility, hidden, visible,
fill with nonzero and evenodd, opacity, fill-opacity,
stroke, stroke-width, stroke-dasharray, stroke-dashoffset, stroke-opacity,
stroke-linecap with butt, round and square,
stroke-linejoin with miter, round and  bevel, stroke-miterlimit
fill-rule, font-size,
transform with matrix, translate, scale, rotate, skewX and  skewY,
stop-color, stop-opacity, offset, id, class
.RE
.
Currently only SVG images reading and conversion into (pixel-based
format) photos is supported: Tk does not (yet) support bundling photo
images in SVG vector graphics.
.VE 8.6
.VS 8.7
.SH "COLOR FORMATS"
.PP
The default image handler can represent/parse color and alpha values
of a pixel in one of the formats listed below. If a color format does
not contain transparency information, full opacity is assumed.  The