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<blockquote data-quote="Dave_W" data-source="post: 84421" data-attributes="member: 9521">dSLR do not work this way, each pixel has to report a value regardless whether that value equals a white pixel (in your paper example) or some other color pixel. Moreover, a pixel reporting a white value number does not represent non-data, it's a color value and requires a numerical number to be generated. In fact, a blank piece of paper is not &quot;white&quot; and each paper type is different. Some have a tanish hue while others have a yellowish-ness to them. On top of that, each &quot;color&quot; data is the sum total of 3 sensors - a red, blu and green sensitive sensor - which all combine to generate a color value. And in the case of a piece of paper, it is not true white at all, rather it is a shade of white. This is why they tell you not to use white paper when setting your WB value and instead to use an 18% gray card.But to the OP's original point, color does not determine size of file being generated, rather the JPEG compression being used is the determinant of file size. &quot;Fine&quot; produces a less compressed file than &quot;large&quot; produces. In the case of RAW files, the result in a much larger file size because there is no compression (typically) and the file represents the entirety of the data generated by the sensor. In the case of the OP, he was shooting in JPEG &quot;large&quot; believing this was the top setting for his camera instead of shooting in &quot;fine&quot; which is in fact the top setting for his camera. And to complicate things more, a megapixel is a measure of the number of individual light sensitive sensors whereas megabytes (Mp) is a measure of &quot;bytes&quot; of information in a given file. The two very different measurements altogether and do not directly correspond to final file size.</blockquote>

[QUOTE="Dave_W, post: 84421, member: 9521"] dSLR do not work this way, each pixel has to report a value regardless whether that value equals a white pixel (in your paper example) or some other color pixel. Moreover, a pixel reporting a white value number does not represent non-data, it's a color value and requires a numerical number to be generated. In fact, a blank piece of paper is not "white" and each paper type is different. Some have a tanish hue while others have a yellowish-ness to them. On top of that, each "color" data is the sum total of 3 sensors - a red, blu and green sensitive sensor - which all combine to generate a color value. And in the case of a piece of paper, it is not true white at all, rather it is a shade of white. This is why they tell you not to use white paper when setting your WB value and instead to use an 18% gray card. But to the OP's original point, color does not determine size of file being generated, rather the JPEG compression being used is the determinant of file size. "Fine" produces a less compressed file than "large" produces. In the case of RAW files, the result in a much larger file size because there is no compression (typically) and the file represents the entirety of the data generated by the sensor. In the case of the OP, he was shooting in JPEG "large" believing this was the top setting for his camera instead of shooting in "fine" which is in fact the top setting for his camera. And to complicate things more, a megapixel is a measure of the number of individual light sensitive sensors whereas megabytes (Mp) is a measure of "bytes" of information in a given file. The two very different measurements altogether and do not directly correspond to final file size. [/QUOTE]

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