Hume on Impressions and Ideas

When reading David Hume's An Enquiry Concerning Human Understanding, his views of thoughts or ideas and impressions stood out to me the most. According to Hume, impressions are lively and vivid perceptions while ideas come from memory (memory being our imagination), which are less lively and vivid. Impressions are something that we comprehend, as he states "all our more lively perceptions, when we hear or see, or feel, or love, or hate, or desire, or will." So in other words, ideas are based of of our own impressions. One example is the thought of seeing red when feeling anger. The feeling of anger is an impression because it is something we witness. So when we have the memory of anger, we think of the color red because its an idea based off our impression.