Re^5: GD colorAllocate not changing colour

Please note that once a file is loaded inside a GD object, is no more a jpg nor a png: it is loaded into an internal GD format and it is up to you to write it to disk in the desired format.

Also note that saving to png allows you to specify a compression in the range:

> 0-9, where 0 means no compression (largest files, highest quality) and 9 means maximum compression (smallest files, worst quality). A compression level of -1 uses the default compression level selected when zlib was compiled on your system, and is the same as calling png() with no argument.

There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

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Re^6: GD colorAllocate not changing colour by Bod (Parson) on May 16, 2021 at 17:47 UTC
A compression level of -1 uses the default compression level selected when zlib was compiled on your system, and is the same as calling png() with no argument. Oh! That's useful... So it would always be sensible to include a compression level unless you happened to be the one who did the installation.	[reply]