Tools such as fuzzy-select and bucket fill find regions based on a seed-fill algorithm. The seed fill starts at the initially selected pixel and progresses in all directions until the difference of pixel intensity from the original is greater than a specified threshold. This value represents the default threshold.
Lorgaidh innealan mar "taghadh neo-phongail" no "lìonadh bucaide" raointean a-rèir algairim sìol-lìonaidh. Tòisichidh an sìol-lìonadh aig a' phiogsail tùsail agus leanaidh e air adhart ceithir timcheall air gus am bi an diofar on phiogsail tùsail nas motha na an stairsneach a chaidh a shònrachadh. 'S e sin luach an stairsnich.