Visual Basic
C#
Managed Extensions for C++
C++/CLI
Parameters
- page
- Page to remove channel.
- channelNumber
- Position of the channel to be removed.
channelNumber
can be within the [0..ChannelCount-1]
range.
Color Space is changed as follows:
- If
page
has more than one Extra channel, color space is unchanged. - If
page
has one Extra channel, ExtraMask is cleared. - If
page
has Alpha channel and no Extra channels, AlphaMask and PremultAlphaMask are cleared. - If
page
has only color channels, color space is changed to Unknown, and all remaining channels are considered Extra channels.
C# | ![]() |
---|---|
// Separate image into separate images for each channel. ImGearChannelRef[] igChannelRef = ImGearRasterProcessing.SeparateChannels(igRasterPage); // Remove the alpha channel from an RGBA image. ImGearRasterProcessing.RemoveChannel(igRasterPage, 3); // Save the page out without the alpha channel. using (FileStream localFile = new FileStream("withoutalpha.jpg", FileMode.Create)) { ImGearFileFormats.SavePage(igRasterPage,localFile, 0, ImGearSavingModes.OVERWRITE, ImGearSavingFormats.JPG); } //Set the colorspace to RGBA again. ImGearRasterProcessing.ConvertColorSpace( igRasterPage, new ImGearColorSpace(ImGearColorSpaceIDs.RGBA)); // Add the alpha channel back to the image. ImGearRasterProcessing.InsertChannel(igRasterPage, 3, igChannelRef[3]); // Remove the alpha channel added by the colorspace conversion. ImGearRasterProcessing.RemoveChannel(igRasterPage, 4); |
Visual Basic | ![]() |
---|---|
' Separate image into separate images for each channel. Dim igChannelRef As ImGearChannelRef() = ImGearRasterProcessing.SeparateChannels(igRasterPage) ' Remove the alpha channel from an RGBA image. ImGearRasterProcessing.RemoveChannel(igRasterPage, 3) ' Save the page out without the alpha channel. Using localFile As New FileStream("withoutalpha.jpg", FileMode.Create) ImGearFileFormats.SavePage(igRasterPage, localFile, 0, ImGearSavingModes.OVERWRITE, ImGearSavingFormats.JPG) End Using 'Set the colorspace to RGBA again. ImGearRasterProcessing.ConvertColorSpace(igRasterPage, New ImGearColorSpace(ImGearColorSpaceIDs.RGBA)) ' Add the alpha channel back to the image. ImGearRasterProcessing.InsertChannel(igRasterPage, 3, igChannelRef(3)) ' Remove the alpha channel added by the colorspace conversion. ImGearRasterProcessing.RemoveChannel(igRasterPage, 4) |