{"id":10921,"date":"2006-04-25T12:17:48","date_gmt":"2006-04-25T12:17:48","guid":{"rendered":"https:\/\/blogs.msdn.microsoft.com\/powershell\/2006\/04\/25\/image-conversion\/"},"modified":"2019-02-18T13:25:07","modified_gmt":"2019-02-18T20:25:07","slug":"image-conversion","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/powershell\/image-conversion\/","title":{"rendered":"Image Conversion"},"content":{"rendered":"
 <\/div>\n
I needed to convert some images from bmp to gif for a web site I’ve been working on.  I figured that I could script this pretty easy – here’s what I came up with.  It’s a little more general than I needed, and I thought it might be useful to others.  Anyway, it’s useful to me.  <\/div>\n
 <\/div>\n
 <\/div>\n
# Convert one graphic image to another
param ( $inFile, $type = “gif”, $outFile, [switch]$force )
#
# First check to see if our input file exists
$iFile = (resolve-path $inFile -ea silentlycontinue ).path
if ( ! $iFile ) { “File ‘$inFile’ not found, exiting” ; exit } <\/font><\/div>\n
<\/font> <\/div>\n
# now check to see if the output file exists, if force
# we will continue, otherwise we exit
if ( ! $outFile )
{
    $tFile = get-item (resolve-path $inFile)
    $outFile = $tFile.Fullname -replace ($tFile.Extension + “`$”),”.$type”
}
if ( (test-path $outFile) -and (! $force) ) { “File ‘$outFile’ exists, exiting”; exit } <\/font><\/div>\n
<\/font> <\/div>\n
# make sure we have an encoder before changing anything on
# the filesystem
$codecs = [drawing.imaging.ImageCodecInfo]::GetImageEncoders() |
        foreach { $h = @{} } { $h.($_.formatdescription) = $_ } { $h }
$encoder = $codecs.$type
if ( ! $encoder ) 
{
        “No encoder of type ‘$type’, exiting”;
        “Available encodings are: ” + [string]::Join(“, “, $h.keys)
        exit
} <\/font><\/div>\n
<\/font> <\/div>\n
# This hoop is needed because resolve-path needs
# the file to actually exist.  We shouldn’t get here
# unless the file doesn’t exist, or we’re going to remove it
# by force.
if ( test-path $outFile ) { remove-item $outFile }
[void](new-item -type file $outFile)
$outFile = (resolve-path $outFile).path
remove-item $outFile <\/font><\/div>\n
<\/font> <\/div>\n
# read the image
$image = [system.drawing.image]::FromFile($iFile)
$image.Save($outFile, $encoder.FormatId)
$image.Dispose()
# Get the file we just created
get-item $outFile<\/font> <\/div>\n
 <\/div>\n","protected":false},"excerpt":{"rendered":"

  I needed to convert some images from bmp to gif for a web site I’ve been working on.  I figured that I could script this pretty easy – here’s what I came up with.  It’s a little more general than I needed, and I thought it might be useful to others.  Anyway, it’s useful […]<\/p>\n","protected":false},"author":600,"featured_media":13641,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10921","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-powershell"],"acf":[],"blog_post_summary":"

  I needed to convert some images from bmp to gif for a web site I’ve been working on.  I figured that I could script this pretty easy – here’s what I came up with.  It’s a little more general than I needed, and I thought it might be useful to others.  Anyway, it’s useful […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/posts\/10921","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/users\/600"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/comments?post=10921"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/posts\/10921\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/media\/13641"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/media?parent=10921"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/categories?post=10921"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/powershell\/wp-json\/wp\/v2\/tags?post=10921"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}