Old pictures saved as .pct files are not that common nowadays and those you will find are certainly years if not decades old. However, some graphics editors and converters still support it and can work with it, as well as convert it to other graphics formats, including TIFF format (.tif, .tiff).
Convert Apple Macintosh QuickDraw/PICT bitmap graphics format to Aldus Tagged Image File Format (TIFF) bitmap image.
We have found 5 software records in our database eligible for .pct to .tif file format conversion.
Microsoft Windows software - convert pct to tif on Windows
A graphics design tool for making 3D landscaping and animations
Convert from pct file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned pct to tif. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A 3D CAD translation softwate
A photo and graphics editor from Ability productivity suites
Apple macOS / Mac OS X software - convert pct to tif on OS X
3D modeling and animation package for Mac.
Multiplatform software - convert pct to tif on any platform
Graphic editor for diagrams and simple graphics from OpenOffice.org suite