Digital images are encoded in binary file format for transmitting and storing them. The various file formats supported for digital images are RAW, JPEG and TIFF formats. The most commonly used image file format is JPEG and uses compression technique while storing images. This file format allows images to be compressed such that you can store more photos onto the device. For instance, 128MB memory card can store up to maximum of 90 photos while other formats like are able to store 40 photos using this storage capacity. Image file consists of mainly two parts called file header and image data. The header part consists of version identification, type of image, width and height of the image. While the image data specifies the order in which pixel image values are stored. Each file format has certain features, which make them suitable for various applications. JPEG (Joint Photographic Expert Group), which was created by group of International Organization for Standardisation (ISO) currently used standard for image compression. The file extension used for this format is .jpg. These are useful for decreasing files for sending emails through internet. JPEG can store a single raster image in 24-bit color. These jpeg files may lose in certain scenarios like removing memory card abruptly during copy process, unintentionally deleting files from memory cards or other storage devices, virus attack etc. In this situation to recover these jpeg files, jpeg image recovery software is to be used.
Most of the digital images are never printed. These are viewed in your monitor, as an email attachment, or as web image in digital form. There are many advantages using jpeg image files. JPEG files are platform independent and support high levels of compression. Because of this compression feature only, data is stored and transmitted effectively to other storage devices. JPEG2000 was also released by the group, which helps in progressive image downloading. The progressive image downloading helps to download lower resolution version of an image and allows downloading more detailed version if needed. The main difference between JPEG and JPEG200 is JPEG use DCT based image compression where as JPEG200 use wavelet based image compression technique. One of the main disadvantage with JPEG files is that it does not support dynamic range i.e., it is not suitable for high quality pictures. While using this format do not open and save it many times. The more times you open and resaved it reduces its quality as it uses lossy compression scheme.
Take backup of your images regularly whenever you add save new images to your system. This backup file helps to restore back data during data loss.
Remo Recover (Windows)-Media Edition is suggested to recover deleted or lost photos, audio, video files from memory card. This photo rescue software recovers media files from formatted partitions or after re-installing Windows. This tool recovers lost files from various memory cards like SD card, CF card, MMC card etc. You can preview recovered files prior to data restoration where you can evaluate recovery chances of the tool when you download trial version of the software.