batik-codec/src/main/java/org/apache/batik/ext/awt/image/codec/png/PNGImageDecoder.java [1132:1155]:
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    private void parse_pHYs_chunk(PNGChunk chunk) {
        int xPixelsPerUnit = chunk.getInt4(0);
        int yPixelsPerUnit = chunk.getInt4(4);
        int unitSpecifier = chunk.getInt1(8);

        if (encodeParam != null) {
            encodeParam.setPhysicalDimension(xPixelsPerUnit,
                                             yPixelsPerUnit,
                                             unitSpecifier);
        }
        if (emitProperties) {
            properties.put("x_pixels_per_unit", xPixelsPerUnit);
            properties.put("y_pixels_per_unit", yPixelsPerUnit);
            properties.put("pixel_aspect_ratio",
                    (float) xPixelsPerUnit / yPixelsPerUnit);
            if (unitSpecifier == 1) {
                properties.put("pixel_units", "Meters");
            } else if (unitSpecifier != 0) {
                // Error -- unit specifier must be 0 or 1
                String msg = PropertyUtil.getString("PNGImageDecoder12");
                throw new RuntimeException(msg);
            }
        }
    }
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batik-codec/src/main/java/org/apache/batik/ext/awt/image/codec/png/PNGRed.java [1143:1166]:
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    private void parse_pHYs_chunk(PNGChunk chunk) {
        int xPixelsPerUnit = chunk.getInt4(0);
        int yPixelsPerUnit = chunk.getInt4(4);
        int unitSpecifier = chunk.getInt1(8);

        if (encodeParam != null) {
            encodeParam.setPhysicalDimension(xPixelsPerUnit,
                                             yPixelsPerUnit,
                                             unitSpecifier);
        }
        if (emitProperties) {
            properties.put("x_pixels_per_unit", xPixelsPerUnit);
            properties.put("y_pixels_per_unit", yPixelsPerUnit);
            properties.put("pixel_aspect_ratio",
                    (float) xPixelsPerUnit / yPixelsPerUnit);
            if (unitSpecifier == 1) {
                properties.put("pixel_units", "Meters");
            } else if (unitSpecifier != 0) {
                // Error -- unit specifier must be 0 or 1
                String msg = PropertyUtil.getString("PNGImageDecoder12");
                throw new RuntimeException(msg);
            }
        }
    }
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