Compression | Photography | JPG | JEPG | Digital Camera

[bouldercrotch]

The explanations you give in this video are incorrect. Jpeg compression involves converting RGB information to chrominance and luminance information. A proportion of the chominance information is then discarded, and the image is then divided into blocks, each of which are discrete cosine transformed and the Fourier components quantized. The data is then compressed with a lossless Huffman technique.

Jpeg compression is _not_ simply changing the colour of adjacent pixels. You are incorrect.

[MichaelTheMentor]

@bouldercrotch - I doubt you know what you are talking about- JPEG Compression is in fact Lossy, especially when compression artifacts are visible. Nice try tho!

[vickifrance]

It would be nice if you post a video on how to avoid compression and artifact issues.

[requena79]

@vickifrance you avoid compression issues by zooming onto a detailed area of your image whilst previewing the compressed version of your image, and noticing the artifacts as you compress more. find a happy medium between the original and your compressed version. there are always going to be some artifacts with compression. it's also about using the right image formats. gif = good for illustrations with minimal shading. jpg = good for images with shading (photos). png = good for transparency

[ESTIBENFUL]

HHGJGUFBNHY

[Answering123]

Very good, thank you.

[votebailey2012]

good explanation for the beginner.

[moriscengic]

not helpfull but interesting.

[allupallu]

thnx :P