BitMiracle.LibTiff.Classic.Tiff.GetField C# (CSharp) Method

        public FieldValue[] GetField(TiffTag tag)
        {
            TiffFieldInfo fip = FindFieldInfo(tag, TiffType.ANY);
            if (fip != null && (isPseudoTag(tag) || fieldSet(fip.Bit)))
                return m_tagmethods.GetField(this, tag);

            return null;
        }

        public bool tiffcvt(Tiff inImage, Tiff outImage)
        {
            FieldValue[] result = inImage.GetField(TiffTag.IMAGEWIDTH);
            if (result == null)
                return false;
            int width = result[0].ToInt();

            result = inImage.GetField(TiffTag.IMAGELENGTH);
            if (result == null)
                return false;
            int height = result[0].ToInt();

            copyField(inImage, outImage, TiffTag.SUBFILETYPE);
            outImage.SetField(TiffTag.IMAGEWIDTH, width);
            outImage.SetField(TiffTag.IMAGELENGTH, height);
            outImage.SetField(TiffTag.BITSPERSAMPLE, 8);
            outImage.SetField(TiffTag.COMPRESSION, m_compression);
            outImage.SetField(TiffTag.PHOTOMETRIC, Photometric.RGB);

            copyField(inImage, outImage, TiffTag.FILLORDER);
            outImage.SetField(TiffTag.ORIENTATION, Orientation.TOPLEFT);

            if (m_noAlpha)
                outImage.SetField(TiffTag.SAMPLESPERPIXEL, 3);
            else
                outImage.SetField(TiffTag.SAMPLESPERPIXEL, 4);

            if (!m_noAlpha)
            {
                short[] v = new short[1];
                v[0] = (short)ExtraSample.ASSOCALPHA;
                outImage.SetField(TiffTag.EXTRASAMPLES, 1, v);
            }

            copyField(inImage, outImage, TiffTag.XRESOLUTION);
            copyField(inImage, outImage, TiffTag.YRESOLUTION);
            copyField(inImage, outImage, TiffTag.RESOLUTIONUNIT);
            outImage.SetField(TiffTag.PLANARCONFIG, PlanarConfig.CONTIG);

            if (!m_testFriendly)
                outImage.SetField(TiffTag.SOFTWARE, Tiff.GetVersion());

            copyField(inImage, outImage, TiffTag.DOCUMENTNAME);
            
            if (m_processByBlock && inImage.IsTiled())
                return cvt_by_tile(inImage, outImage, width, height);
            else if (m_processByBlock)
                return cvt_by_strip(inImage, outImage, width, height);

            return cvt_whole_image(inImage, outImage, width, height);
        }