Bitmap Viewer Esko

The hallmark of a professional bitmap viewer is speed. Esko’s implementation uses optimized memory management. You can instantaneously zoom from a full press sheet view down to a 0.1mm halftone dot without waiting for re-rendering. This is known as "Resolution Independent Zoom."

The tool handles two distinct types of data:

Assume you are a prepress operator using Esko ArtPro+ (the modern replacement for ArtPro and PackEdge for many workflows). You have a flexo file ready for screening.

Step 1: Rasterize the File Before you can view a bitmap, the file must be rasterized. In ArtPro+, you go to Process > Create Bitmap. Here you select your screening (Samba, Pearls, default conventional), line screen (e.g., 150 lpi), and resolution (e.g., 2400 dpi). You output to a temporary TIFF or directly to the Bitmap Viewer. bitmap viewer esko

Step 2: Launch the Bitmap Viewer After rasterization, click the Bitmap Viewer icon on the toolbar or select View > Bitmap View. The application will load the raster memory.

Step 3: Navigate

Step 4: Select Screening Separations In the "Layers" or "Separations" panel of the viewer, toggle on "Cyan" only. Examine the dot structure. Note the shape and angle. Now toggle on "Magenta" only. Note its angle. Finally, toggle both on simultaneously. Look for a consistent, uniform rosette pattern. If you see dark clumps or long wavy lines, you have a moiré risk. The hallmark of a professional bitmap viewer is speed

Step 5: Measure Critical Areas Navigate to a highlight area (like a sky or a smooth gradient). Use the "Info" tool to click on a dot. Ensure that the smallest dot present is above your press's minimum threshold (e.g., if your provider says 2% dots hold, ensure you don't see any 1% dots). Navigate to a shadow area (near 90%). Ensure the dots aren't touching too much.

Step 6: Compare and Save Use the Snapshot feature to save a view (e.g., "3% dot in Cyan.png") for your quality report. If using Automation Engine, you can export a Bitmap Viewer report automatically as part of a Proof of Concept (PoC).

Moiré patterns occur when the frequency or angle of two screens interfere with each other. This is especially dangerous in packaging where you have multiple spot colors (e.g., Pantone 185, 300, 347) overprinting. A moiré invisible in a PDF proof can become catastrophic on a plate. By viewing the actual TIFF bitmap in the Esko viewer, an operator can examine the super-position of dots (the rosette) and adjust angles before platemaking. Step 4: Select Screening Separations In the "Layers"

| Tool | Best for | Cost | |------|----------|------| | KaleidaGraph (not relevant) – ignore | | | | Global Vision PerfectProof | Pixel-level comparison | High | | Acrobat Pro + PitStop | Vector & raster inspection | Medium | | GIMP | Manual dot inspection (tedious) | Free | | DotView (by GMG) | Screening analysis | Medium |

But none match Esko Bitmap Viewer for prepress + packaging + screening integration.