Images for press:
RASTER images (working in Photoshop):
- Ask for original images.
- Request .tiff, .raw, or .psd files. Avoid .jpg, .png, and .gif.
- Review for quality.
- Image Size Rez min: 250dpi + at dimension(s) it will need to print
- Over compressed .jpg results in artifacts. Try to get original image.
- Typically used color profiles (check with your printer):
- U.S. Web Coated (SWOP) v2 for Magazines
- ISOnewspaper30v4GCR4 for NYTimes newsprint
- U.S. Sheetfed Coated (SWOP) v2 for packaging and brochures
- U.S. Sheetfed Uncoated (SWOP) v2 for packaging and brochures
- Change images with 16 bits/channel down to 8 before sending to press.
- Newsprint total ink coverage: Add C+M+Y+K, if the sum is more than 240 then it is too much ink. Typically Magazine paper can handle 280-320 or even higher.
- Do NOT multiply too many layers in PS … this can result in creating colors that are unprintable (see 8). If you do work this way, then create a final flattened file and merge the layers, then apply the appropriate color profile.
- Adjust colors using levels or curves in adjustment layers.
- Avoid using brightness/contrast … levels (or Curves) are far superior for adjusting contrast. They can also be used to adjust colors separately.
- The major issues with Newsprint involve the higher end of mid tones … simply making whiter whites and darker darks does not make it better.
VECTOR images (working in Illustrator):
- Unless printing SPOT colors, convert them to CMYK.
- Convert RGB to CMYK.
- Be sure white is NOT set to overprint.
- Colors can be set to overprint if you want that effect of transparency. Also edges of shapes can be set to overprint for trapping.
- If printing BW, be sure that black is NOT a Rich Black (built of CMYK).
- Be sure there are no embedded or raster images.