我正在尝试将大小为2496 x 3512的图片缩放到PDF文档中。我使用PDFBox生成PDF文档,但缩放后的图像变得模糊。
以下是一些片段:
由page.findMediaBox().createDimension()返回的PDF页面大小(A4):java.awt.Dimension[width=612,height=792]
然后我根据页面大小与图像大小计算出缩放后的维度,结果为:java.awt.Dimension[width=562,height=792]。我使用下面的代码来计算缩放后的维度:
public static Dimension getScaledDimension(Dimension imgSize, Dimension boundary) { int original_width = imgSize.width; int original_height = imgSize.height; int bound_width = boundary.width; int bound_height = boundary.height; int new_width = original_width; int new_height = original_height; // first check if we need to scale width if (original_width > bound_width) { //scale width to fit new_width = bound_width; //scale height to maintain aspect ratio new_height = (new_width * original_height) / original_width; } // then check if we need to scale even with the new height if (new_height > bound_height) { //scale height to fit instead new_height = bound_height; //scale width to maintain aspect ratio new_width = (new_height * original_width) / original_height; } return new Dimension(new_width, new_height); }
为了实际执行图像缩放,我正在使用Image Scalr API:
BufferedImage newImg = Scalr.resize(img, Scalr.Method.ULTRA_QUALITY, Scalr.Mode.FIT_EXACT, scaledWidth, scaledHeight, Scalr.OP_ANTIALIAS);
我的问题是我做错了什么?当将大图缩小到较小的尺寸时,它不应该模糊。这是否与PDF页面分辨率/大小有关?
谢谢,
Gyo