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.TH "THUMBNAIL" "1" "Jun 10, 2023" "4.5" "LibTIFF"
.SH NAME
thumbnail \- create a TIFF file with thumbnail images
.SH SYNOPSIS
.sp
\fBthumbnail\fP [ \fIoptions\fP ] \fIinput.tif\fP \fIoutput.tif\fP
.SH DESCRIPTION
.sp
\fBthumbnail\fP is a program written to show how one might use the
\fBSubIFD\fP tag (#330) to store thumbnail images.
\fBthumbnail\fP
copies a TIFF Class F facsimile file to the output file
and for each image an 8\-bit greyscale \(dqthumbnail sketch\(dq is created.
The output file contains the thumbnail image with the associated
full\-resolution page linked below with the SubIFD tag.
.sp
By default, thumbnail images are 216 pixels wide by 274 pixels high.
Pixels are calculated by sampling and filtering the input image
with each pixel value passed through a contrast curve.
.SH OPTIONS
.INDENT 0.0
.TP
.B \-w width
Specify the width of thumbnail images in pixels.
.UNINDENT
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.TP
.B \-h height
Specify the height of thumbnail images in pixels.
.UNINDENT
.INDENT 0.0
.TP
.B \-c contrast
Specify a contrast curve to apply in generating the thumbnail images.
By default pixels values are passed through a linear contrast curve
that simply maps the pixel value ranges.  Alternative curves are:
.TS
center;
|l|l|.
_
T{
Curve
T}	T{
Description
T}
_
T{
exp50
T}	T{
50% exponential curve
T}
_
T{
exp60
T}	T{
60% exponential curve
T}
_
T{
exp70
T}	T{
70% exponential curve
T}
_
T{
exp80
T}	T{
80% exponential curve
T}
_
T{
exp90
T}	T{
90% exponential curve
T}
_
T{
exp
T}	T{
pure exponential curve
T}
_
T{
linear
T}	T{
linear curve
T}
_
.TE
.UNINDENT
.SH BUGS
.sp
There are no options to control the format of the saved thumbnail images.
.SH SEE ALSO
.sp
\fI\%tiffdump\fP (1),
\fI\%tiffgt\fP (1),
\fI\%tiffinfo\fP (1),
\fI\%libtiff\fP (3tiff),
.SH AUTHOR
LibTIFF contributors
.SH COPYRIGHT
1988-2022, LibTIFF contributors
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