An abbreviation for 'negative' (negative film) in photography/printing — the film or image with inverted tones used in processing.
古いネガをデジタル化してアルバムにまとめた。
I digitized old negatives and compiled them into an album.
撮影したネガに傷がついてしまって、修復が必要だ。
The negative we shot got scratched and needs restoration.
An abbreviation of 'negative', used colloquially to describe a negative (pessimistic) attitude or feeling.
あの人は何でもネガで考えるので、話していると疲れることがある。
That person thinks negatively about everything, so talking to them can be tiring.
会議でネガな意見ばかり言うのは建設的ではない。
Constantly offering negative opinions in a meeting isn't constructive.