in program want load png or ico file (with transparency) , save ico file transparency.
this random png image testing:
...as can see haves transparency.
but when try convert ico result:
(picture taken windows explorer)
all black color lost.
i've tried same conversion using profesional software photoshop, or toycon , result ico file don't have problem.
this code, first time i'm using freeimage , don't know images , alpha-channels or transparency:
imports freeimageapi 'dim img freeimageapi.fibitmap = freeimage.load(format, file, free_image_load_flags.ico_makealpha) public class form1 dim file string = "c:\users\administrador.elektro-pc\desktop\auricular 5.png" private sub form1_load(sender object, e eventargs) handles mybase.shown dim format freeimageapi.free_image_format = freeimage.getfiletype(file, 32) dim img freeimageapi.fibitmap = freeimage.loadex(file) dim transparency byte() = new byte(0) {} freeimage.settransparencytable(img, transparency) freeimage.save(free_image_format.fif_ico, img, "c:\test.ico", free_image_save_flags.default) end sub end class
done.
i've deleted transparency table , seems working fine, no need set transparency @ last, did newbie helper class manage basic functions of library (convert image, rotate, grayscale, resize...) in easy way:
#region " freeimage helper " ' [ freeimage helper ] ' ' // elektro h@cker ' ' ' instructions: ' 1. add reference "freeimagenet.dll" in project. ' 2. add "freeimage.dll" in project. ' ' ' examples : ' ' msgbox(freeimagehelper.is_avaliable() ' result: true ' msgbox(freeimagehelper.get_version() ' result: 3.15.1 ' msgbox(freeimagehelper.get_imageformat("c:\test.png")) ' result: png ' ' freeimagehelper.convert("c:\test.png", "c:\test.ico", freeimageapi.free_image_format.fif_ico) ' freeimagehelper.convert(new bitmap("c:\test.png"), "c:\test.jpg", freeimageapi.free_image_format.fif_jpeg, freeimageapi.free_image_save_flags.jpeg_subsampling_444 or freeimageapi.free_image_save_flags.jpeg_qualitysuperb) ' ' picturebox1.backgroundimage = freeimagehelper.grayscale(new bitmap("c:\test.bmp")) ' picturebox1.backgroundimage = freeimagehelper.grayscale("c:\test.bmp") ' ' picturebox1.backgroundimage = freeimagehelper.resize(new bitmap("c:\test.bmp"), 32, 32) ' picturebox1.backgroundimage = freeimagehelper.resize("c:\test.bmp", 64, 128) ' ' picturebox1.backgroundimage = freeimagehelper.rotate(new bitmap("c:\test.bmp"), 90) ' picturebox1.backgroundimage = freeimagehelper.rotate("c:\test.bmp", -90) ' ' picturebox1.backgroundimage = freeimagehelper.thumbnail(new bitmap("c:\test.png"), 64, true) ' picturebox1.backgroundimage = freeimagehelper.thumbnail("c:\test.png", 64, true) imports freeimageapi public class freeimagehelper ' <summary> ' checks if <i>freeimage.dll</i> avaliable on system. ' </summary> public shared function is_avaliable() boolean return freeimage.isavailable end function ' <summary> ' gets version of freeimage.dll. ' </summary> shared function get_version() string return freeimage.getversion end function ' <summary> ' gets image format of image file. ' </summary> shared function get_imageformat(byval file string) string return freeimage.getfiletype(file, 0).tostring.substring(4) end function ' <summary> ' convert bitmap object between image formats , save disk. ' </summary> shared sub convert(byval bmp system.drawing.bitmap, _ byval output string, _ byval newformat free_image_format, _ optional byval saveflags free_image_save_flags = free_image_save_flags.default) try freeimage.savebitmap(bmp, output, newformat, saveflags) catch ex exception ' throw new exception(ex.message) msgbox(ex.message) end try end sub ' <summary> ' convert image file between image formats , save disk. ' </summary> shared sub convert(byval file string, _ byval output string, _ byval newformat free_image_format, _ optional byval saveflags free_image_save_flags = free_image_save_flags.default) try freeimage.save(newformat, freeimage.loadex(file), output, saveflags) catch ex exception ' throw new exception(ex.message) msgbox(ex.message) end try end sub ' <summary> ' grayscales bitmap object. ' </summary> shared function grayscale(byval bmp system.drawing.bitmap) system.drawing.bitmap try dim imagestream new system.io.memorystream bmp.save(imagestream, bmp.rawformat) dim image fibitmap = freeimage.loadfromstream(imagestream) imagestream.dispose() return freeimage.getbitmap(freeimage.converttogreyscale(image)) catch ex exception ' throw new exception(ex.message) msgbox(ex.message) return nothing end try end function ' <summary> ' grayscales image file. ' </summary> shared function grayscale(byval file string) system.drawing.bitmap try return freeimage.getbitmap(freeimage.converttogreyscale(freeimage.loadex(file))) catch ex exception ' throw new exception(ex.message) msgbox(ex.message) return nothing end try end function ' <summary> ' resizes bitmap object. ' </summary> shared function resize(byval bmp system.drawing.bitmap, _ byval x int32, _ byval y int32, _ optional byval quality free_image_filter = free_image_filter.filter_bilinear) system.drawing.bitmap try dim imagestream new system.io.memorystream bmp.save(imagestream, bmp.rawformat) dim image fibitmap = freeimage.loadfromstream(imagestream) imagestream.dispose() return freeimage.getbitmap(freeimage.rescale(image, x, y, quality)) catch ex exception ' throw new exception(ex.message) msgbox(ex.message) return nothing end try end function ' <summary> ' resizes image file. ' </summary> shared function resize(byval file string, _ byval x int32, _ byval y int32, _ optional byval quality free_image_filter = free_image_filter.filter_bilinear) system.drawing.bitmap try return freeimage.getbitmap(freeimage.rescale(freeimage.loadex(file), x, y, quality)) catch ex exception ' throw new exception(ex.message) msgbox(ex.message) return nothing end try end function ' <summary> ' rotates bitmap object. ' </summary> shared function rotate(byval bmp system.drawing.bitmap, _ byval angle double) system.drawing.bitmap try dim imagestream new system.io.memorystream bmp.save(imagestream, bmp.rawformat) dim image fibitmap = freeimage.loadfromstream(imagestream) imagestream.dispose() return freeimage.getbitmap(freeimage.rotate(image, angle)) catch ex exception ' throw new exception(ex.message) msgbox(ex.message) return nothing end try end function ' <summary> ' rotates image file. ' </summary> shared function rotate(byval file string, _ byval angle double) system.drawing.bitmap try return freeimage.getbitmap(freeimage.rotate(freeimage.loadex(file), angle)) catch ex exception ' throw new exception(ex.message) msgbox(ex.message) return nothing end try end function ' <summary> ' returns thumbnail of bitmap object. ' </summary> shared function thumbnail(byval bmp system.drawing.bitmap, _ byval size int32, _ byval convert boolean) system.drawing.bitmap try dim imagestream new system.io.memorystream bmp.save(imagestream, bmp.rawformat) dim image fibitmap = freeimage.loadfromstream(imagestream) imagestream.dispose() return freeimage.getbitmap(freeimage.makethumbnail(image, size, convert)) catch ex exception ' throw new exception(ex.message) msgbox(ex.message) return nothing end try end function ' <summary> ' returns thumbnail of image file. ' </summary> shared function thumbnail(byval file string, _ byval size int32, _ byval convert boolean) system.drawing.bitmap try return freeimage.getbitmap(freeimage.makethumbnail(freeimage.loadex(file), size, convert)) catch ex exception ' throw new exception(ex.message) msgbox(ex.message) return nothing end try end function end class #end region 
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