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David Maynard
Retired Computer Scientist: SRI-ARC (Engelbart), Xerox PARC, Xerox SDS, Electronic Arts, SGI, Google, Box
Workspace
Fork
Public
By
David Maynard
Edited
Sep 4, 2023
Fork of
Image processing: point operations
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function
brightness
(
data
,
delta
)
{
for
(
let
i
=
0
;
i
<
data
.
length
;
i
+=
4
)
{
data
[
i
+
0
]
=
data
[
i
+
0
]
+
delta
;
data
[
i
+
1
]
=
data
[
i
+
1
]
+
delta
;
data
[
i
+
2
]
=
data
[
i
+
2
]
+
delta
;
}
}
Insert cell
function
multiplication
(
data
,
factor
)
{
for
(
let
i
=
0
;
i
<
data
.
length
;
i
+=
4
)
{
data
[
i
+
0
]
*=
factor
;
data
[
i
+
1
]
*=
factor
;
data
[
i
+
2
]
*=
factor
;
}
}
Insert cell
function
contrast
(
data
,
factor
)
{
for
(
let
i
=
0
;
i
<
data
.
length
;
i
+=
4
)
{
data
[
i
+
0
]
=
(
data
[
i
+
0
]
-
127
)
*
factor
+
127
;
data
[
i
+
1
]
=
(
data
[
i
+
1
]
-
127
)
*
factor
+
127
;
data
[
i
+
2
]
=
(
data
[
i
+
2
]
-
127
)
*
factor
+
127
;
}
}
Insert cell
function
gamma
(
data
,
power
)
{
for
(
let
i
=
0
;
i
<
data
.
length
;
i
+=
4
)
{
data
[
i
+
0
]
=
255
*
Math
.
pow
(
data
[
i
+
0
]
/
255
,
power
)
;
data
[
i
+
1
]
=
255
*
Math
.
pow
(
data
[
i
+
1
]
/
255
,
power
)
;
data
[
i
+
2
]
=
255
*
Math
.
pow
(
data
[
i
+
2
]
/
255
,
power
)
;
}
}
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function
mask
(
data
,
nbits
)
{
for
(
let
i
=
0
;
i
<
data
.
length
;
i
+=
4
)
{
data
[
i
+
0
]
=
(
data
[
i
+
0
]
>>
nbits
)
<<
nbits
;
data
[
i
+
1
]
=
(
data
[
i
+
1
]
>>
nbits
)
<<
nbits
;
data
[
i
+
2
]
=
(
data
[
i
+
2
]
>>
nbits
)
<<
nbits
;
}
}
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function
xor
(
data
,
nbits
)
{
const
datamask
=
(
0xff
)
>>
(
8
-
nbits
)
;
for
(
let
i
=
0
;
i
<
data
.
length
;
i
+=
4
)
{
data
[
i
+
0
]
=
(
data
[
i
+
0
]
^
datamask
)
;
data
[
i
+
1
]
=
(
data
[
i
+
1
]
^
datamask
)
;
data
[
i
+
2
]
=
(
data
[
i
+
2
]
^
datamask
)
;
}
}
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// url = "https://upload.wikimedia.org/wikipedia/commons/thumb/c/cf/Cappuchin_Bridge_(30706076020).jpg/1079px-Cappuchin_Bridge_(30706076020).jpg"
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url
=
"https://pbs.twimg.com/media/F0milJeXsAANd6v?format=jpg&name=small"
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One platform
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Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
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