Image quality and scaling
- For the first time, ZePrA 3 will give customers the possibility of reducing the resolution of pixel images (JPEG, TIFF, PSD) and images in PDF files. The Downsample images scaling function permits the downsampling of images above a customer-defined Threshold resolution, e.g. for the Web or to a resolution required for printing.
- The Threshold value ensures that images are only downsampled if a certain resolution is exceeded.
Note: It makes no sense to downsample images to 72 ppi for the Web, for example, if they already have a resolution that is only slightly higher, e.g. 100 ppi.
- To compensate for the unsharpness occurring when downsampling images, a bicubic interpolation method according to Catmull is applied in the background. This leads to the best results when downscaling, and already includes slight sharpening.
- If you find the sharpness inadequate after downsampling images in ZePrA, you can activate the Apply to: All downscaled images option and resharpen them using the tools under Sharpening, thus having every freedom at your disposal for processing.
- In ZePrA 3, we offer the option of preserving the Compression method of the original image files (Automatic), or of changing it to lossless compression or JPEG compression with specifiable quality. For example, this permits lossless saving of JPEG pixel images in ZePrA in the form of TIFF or PSD images following processing. Similarly, JPEG-compressed images in PDF files can be ZIP-compressed without losses.
Note: The size of PDFs can be significantly reduced if you downsample images whose resolution is too high for the ultimate output application, and combine this with a lower JPEG quality.
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