05. Basics: "PRO" Images = TIFF! & PRO Image Compression Basics - linuxgurugamer/HumanStuff GitHub Wiki
WHEN SAVING "IN PROGRESS" ALWAYS SAVE TO PDN! WEBP & TIFF "FLATTEN"!
* USE JPEG/PNG = NEVER! RLE COMPRESSED TIFF & LOSSLESS WEBP IS BETTER IN EVERY WAY
About Image File Compression
Many file formats use compression to reduce the file size of bitmap images. Lossless techniques compress the file without removing image detail or color information; lossy techniques remove detail. The following are commonly used compression techniques:
TIFF Lossless Compression, A BETTER Alternative To Most FOR FINAL PRODUCT!
An alternative option for those wishing to take advantage of the feature-rich TIFF format, but still reap the modest file size reduction found in the WEBP, is to save your files using a variation of the TIFF format that utilizes the same type of "lossless compression."
To add to this experiment, I saved all of the same scanned images we discussed above in the TIFF format using ZIP lossless compression, and look how the results turned out when compared to the file sizes of the PNG (and WebP is FAR BETTER than PNG).
They are nearly identical.
| Image | TIFF (Original) | PNG | TIFF |
|---|---|---|---|
 |
34.3 MB | 28.1 MB | 28.3 MB |
 |
33.2 MB | 26.8 MB | 27.1 MB |
 |
24.5 MB | 20.8 MB | 20.7 MB |
| File Settings/Type | Uncompressed | Lossless Compression | _Using _ZIP Lossless Compression |
Image File Compression Formats
RLE (Run Length Encoding) * GENERALLY THE BEST OPTION
* Lossless compression; supported by some common Windows file formats.
LZW (Lemple-Zif-Welch)
* Lossless compression; supported by TIFF, PDF, GIF, and PostScript language file formats. Most useful for images with large areas of single color.
JPEG (Joint Photographic Experts Group)
* Lossy compression; supported by JPEG, TIFF, PDF, and PostScript language file formats. Recommended for continuous-tone images, such as photographs. JPEG uses lossy compression. To specify image quality, choose an option from the Quality menu, drag the Quality pop‑up slider, or enter a value between 0 and 12 in the Quality text box. For the best printed results, choose maximum-quality compression. JPEG files can be printed only on Level 2 (or later) PostScript printers and may not separate into individual plates.
CCITT
* A family of lossless compression techniques for black-and-white images, supported by the PDF and PostScript language file formats. (CCITT is an abbreviation for the French spelling of International Telegraph and Telekeyed Consultive Committee.)
ZIP