Color Effects

Color Grading adjusts the visual appearance of PDF pages through rasterization. It's useful for quick creative adjustments, proof corrections, or converting pages to grayscale/sepia without re-exporting from the design application. Note: this rasterizes targeted pages: vector text and paths become bitmap images. For press-accurate color space conversion, use Color Convert with ICC profiles instead.

Best for:Quick Color CorrectionsGrayscale ConversionCreative EffectsProof Adjustments
Open Color EffectsTool page
Color Effects — Applies brightness, contrast, saturation, and color effects to PDF pages.

Color Effects

Tool page

Applies brightness, contrast, saturation, and color effects to PDF pages.

Color Grading adjusts the visual appearance of PDF pages through rasterization. It's useful for quick creative adjustments, proof corrections, or converting pages to grayscale/sepia without re-exporting from the design application. Note: this rasterizes targeted pages: vector text and paths become bitmap images. For press-accurate color space conversion, use Color Convert with ICC profiles instead.

Best for:Quick Color CorrectionsGrayscale ConversionCreative EffectsProof Adjustments
How It Works

Color Grading adjusts the visual appearance of PDF pages through rasterization. It's useful for quick creative adjustments, proof corrections, or converting pages to grayscale/sepia without re-exporting from the design application. Note: this rasterizes targeted pages: vector text and paths become bitmap images. For press-accurate color space conversion, use Color Convert with ICC profiles instead.

Brightness:Overall lightness. 100 = unchanged. Reduce to ~80 for richer prints on bright white paper; increase to ~120 to lighten dark scans. Affects all tones uniformly: not a curves adjustment.
Contrast:Tonal range expansion. Values above 100 push shadows darker and highlights brighter. Useful for flat scans or photos that lack punch. Values below 100 compress the tonal range: useful for muting harsh images.
Saturation:Color intensity. 0 = no color (grayscale). 100 = original. 150+ = boosted vibrance. Be careful above 160:CMYK conversion of oversaturated RGB can produce unprintable values.
Grayscale:Luminance-based desaturation. Useful for creating grayscale versions of color pages for B&W printing. At 100%, the result respects perceptual luminance weights (R:0.299, G:0.587, B:0.114).
Rasterize DPI:Higher DPI = better quality but larger file size and slower processing. 300 DPI is the standard for offset and digital printing. 150 DPI is fine for proofing or web only.
Color Effects — full app view showing options and imposed result

Color Effects tool applied. Options panel on the left, imposed result on the right. Click to zoom.

Options Guide
Color Adjustments

Fine-tune brightness, contrast, and saturation of the page content.

Brightness (0–200): 100 = original. Below 100 darkens, above 100 lightens. Contrast (0–200): 100 = original. Higher values increase the difference between light and dark tones: useful for washed-out scans. Saturation (0–200): 100 = original. 0 = fully desaturated (grayscale equivalent). Above 100 boosts color intensity.

Effects

Apply creative color effects: grayscale, warm tone, invert, or hue shift.

Grayscale (0–100%): progressively removes color information. 100% = full grayscale: an alternative to desaturation that uses a luminance-weighted conversion. Warm Tone (0–100%): applies a sepia/warm cast:20–30% adds subtle warmth, 100% is full vintage sepia. Invert (0–100%): reverses tonal values. 100% = full negative. Hue Rotate (0–360°): shifts all colors around the color wheel. 180° inverts hue (red↔cyan, blue↔yellow). Effects are cumulative and applied in order.

Output Quality

Set the rasterization resolution for the color-graded output.

Color grading rasterizes targeted pages: vector content (text, paths, gradients) becomes a bitmap image. Choose DPI based on your output: 150 DPI for screen/web (fast, small files). 300 DPI for standard commercial print. 600 DPI for high-detail fine art or text-heavy pages (large files, slow processing). Warning: if Color Convert is also in the pipeline, pages will be rasterized twice: compounding quality loss.

Pages

Specify which pages to process using a range expression.

Examples: 'all' = every page. '1-5' = pages 1 through 5. '1,3,5' = specific pages. '1-10 odd' = odd pages 1-9. '2-20 even' = even pages 2-20. 'last' = last page. 'last-2' = third from last. Ranges are 1-based. Combine with commas: '1-5, 8, 12-15'.

Configurations & Variations
Grayscale Conversion

Select the grayscale preset to convert all pages to monochrome. Good for checking tonal range before sending to a black-and-white printer, or previewing how a color design will reproduce in newspaper (single-ink) printing. If any colored elements become indistinguishable in grayscale, they need more tonal separation in the original design.

Grayscale Conversion — settings

Settings to change

Color Effects — Grayscale Conversion

Full app view

Grayscale Conversion — result

Output result

High Contrast Effect

Apply the high-contrast preset to push light and dark areas further apart. Useful for checking whether barcodes meet the minimum contrast ratio for scanner readability, or whether reversed-out text on a tinted background will survive halftone dot gain on press.

High Contrast Effect — settings

Settings to change

Color Effects — High Contrast Effect

Full app view

High Contrast Effect — result

Output result

Expert Tip

Colour grading handles press-specific adjustments, such as reducing total ink coverage to 300% or below for heatset web, or boosting saturation for uncoated stock.

Grading applied after imposition also affects marks and colour bars. Apply it to source pages before imposition so your control strips stay accurate.

Try Color Effects in your browser

PDF Press runs entirely client-side. Upload a PDF, apply Color Effects, and download the result — no upload to a server, no sign-up required.

Open PDF Press