Original sentence: jpg é a mesma coisa que joão pedro gay
Edited sentence: ) There are variations on the standard baseline JPEG that are lossless; however, these are not widely supported.A number of alterations to a JPEG image can be performed losslessly (that is, without recompression and the associated quality loss) as long as the image size is a multiple 1 MCU block (Minimum Coded Unit) (usually 16 pixels in both directions, for 4:2:0 chroma subsampling).Blocks can be rotated in 90 degree increments, flipped in the horizontal, vertical and diagonal axes and moved about in the image.However, progressive JPEGs are not as widely supported, and even some software which does support them (such as some versions of Internet Explorer) only displays the image once it has been completely downloaded.It is also possible to transform between baseline and progressive formats without any loss of quality, since the only difference is the order in which the coefficients are placed in the file.Not all blocks from the original image need to be used in the modified one.The 12-bit JPEG format has been part of the JPEG specification for some time, but again, this format is not as widely supported.The compression method is usually lossy, meaning that some original image information is lost and cannot be restored (possibly affecting image quality.The top and left of a JPEG image must lie on a block boundary, but the bottom and right need not do so.There are also many medical imaging systems that create and process 12-bit JPEG images.There is also an interlaced "Progressive JPEG" format, in which data is compressed in multiple passes of progressively higher detail.This is ideal for large images that will be displayed while downloading over a slow connection, allowing a reasonable preview after receiving only a portion of the data.This limits the possible lossless crop operations, and also what flips and rotates can be performed on an image whose edges do not lie on a block boundary for all channels.Utilities that implement this include  with user interface Jpegcrop, and the  plugin to IrfanView.When using lossless cropping, if the bottom or right side of the crop region is not on a block boundary then the rest of the data from the partially used blocks will still be present in the cropped file and can be recovered relatively easily by anyone with a hex editor and an understanding of the format