ImageGear23.Core Assembly > ImageGear.Processing Namespace > ImGearRasterProcessing Class : RemoveChannel Method |
'Declaration Public Shared Sub RemoveChannel( _ ByVal page As ImGearRasterPage, _ ByVal channelNumber As Integer _ )
'Usage Dim page As ImGearRasterPage Dim channelNumber As Integer ImGearRasterProcessing.RemoveChannel(page, channelNumber)
public static void RemoveChannel( ImGearRasterPage page, int channelNumber )
public: static void RemoveChannel( ImGearRasterPage* page, int channelNumber )
public: static void RemoveChannel( ImGearRasterPage^ page, int channelNumber )
channelNumber
can be within the [0..ChannelCount-1]
range.
Color Space is changed as follows:
page
has more than one Extra channel, color space is unchanged.
page
has one Extra channel, ExtraMask is cleared.
page
has Alpha channel and no Extra channels, AlphaMask and PremultAlphaMask are cleared.
page
has only color channels, color space is changed to Unknown, and all remaining channels are considered Extra channels. // 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);
' 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)