var renderer = new ZplRenderer();
var results = renderer.Render(File.ReadAllText("labels.zpl"));
SKBitmap bmp = results[0].Bitmap;

File.WriteAllBytes("label.pcx", RasterExport.Pcx(bmp));
File.WriteAllBytes("labels.tif", RasterExport.Tiff(results.Select(r => r.Bitmap), TiffCompression.PackBits));
File.WriteAllBytes("label.epl", RasterExport.Epl(bmp));          // EPL2 GW graphic
File.WriteAllBytes("label.fp", RasterExport.Fingerprint(bmp));   // Honeywell/Intermec
File.WriteAllBytes("label.escpos", RasterExport.EscPos(bmp, cut: true));
File.WriteAllBytes("label.pcl", RasterExport.Pcl(bmp, dpi: 300));

// native commands from the label model (text stays text, barcodes stay barcodes)
string epl = LabelLanguageWriter.ToEpl(label);
string fingerprint = LabelLanguageWriter.ToFingerprint(label);
byte[] escpos = LabelLanguageWriter.ToEscPos(label);
byte[] pcl = LabelLanguageWriter.ToPcl(label);

// label model + records natively as EPL2 or Fingerprint (text and barcodes stay commands)
string epl = LabelLanguageWriter.ToEpl(label, parcels, dpi: 203, copies: p => p.Parcels, formName: "VERSAND");
string fp = LabelLanguageWriter.ToFingerprint(label, parcels, dpi: 203, copies: p => p.Parcels);
File.WriteAllText("versand.epl", epl);   // FS/FK form + variables, one data block per record
File.WriteAllText("versand.fp", fp);

TIFF, PCL, ESC/POS NV, GIF, HTML, EPS, mirroring & DPI conversion

TIFF with CCITT G3/G4, LZW, Deflate or PackBits and 1-bit, Gray8, RGB or RGBA; PCL monochrome/gray/color with mode 0/2/3; ESC/POS with NV graphics; GIF, SVG, HTML (embedded as PNG, GIF or SVG) and EPS (optionally as outlines). Outputs can be mirrored (Flip), set to landscape, scaled, made transparent and given DPI metadata. ZplGraphicEncoder converts images with dithering into ^GF (hex, ACS, Z64, B64 or automatically the shortest). ZplRescaler converts raw ZPL between resolutions: origins, label size, shapes, fonts, field blocks, ^BY, 2D module sizes and ^GF graphics.

var s = new ZplRenderSettings
{
    OutputFormat = ZplOutputFormat.Tiff,
    TiffCompression = TiffCompression.CcittGroup4,   // None, CcittGroup3, Lzw, Deflate, PackBits
    TiffPixelFormat = TiffPixelFormat.BlackWhite1,   // Gray8, Rgb24, Rgba32
    Flip = ZplFlip.X, PaperOrientation = ZplPaperOrientation.Landscape,
    WriteDpiMetadata = true,
}.WithLabelSizeMm(100, 60);
byte[] tiff = new ZplRenderer(s).ProcessCommands(zpl)[0];

s.OutputFormat = ZplOutputFormat.Pcl;  s.PclColorMode = PclColorMode.Grayscale; s.PclCompression = PclCompression.DeltaRow;
s.OutputFormat = ZplOutputFormat.Eps;  s.EpsTextAsOutlines = true;
s.OutputFormat = ZplOutputFormat.Html; s.HtmlImageFormat = HtmlLabelImageFormat.Svg;
s.OutputFormat = ZplOutputFormat.Gif;

// ESC/POS: store the graphic once in NV memory, then just recall it
byte[] define = EscPosNv.DefineGraphic(photo, "G1"), print = EscPosNv.PrintGraphic("G1");

// image → ^GF with dithering and the shortest encoding
string gf = ZplGraphicEncoder.ToZpl(photo, GraphicCompression.Auto, DitherMode.FloydSteinberg, x: 20, y: 20);

// convert ZPL from 203 to 300 dpi (coordinates, fonts, ^BY, ^GF …)
string zpl300 = ZplRescaler.Rescale(zpl, 203, 300);

Try it online on zplCloud.com: Image to ZPL · ZPL DPI Converter

More on zplCloud.com: Guide: Graphics in ZPL (^GF)