A digital photograph is required for each applicant while applying for a US visitor visa (also called tourist visa or B2 visa). The photograph must meet certain criteria. A studio can take the picture for you if you mention "photograph needed for US visa".

The head height or facial region (measured from the top of the head, including the hair, to the bottom of the chin) must be between 50% and 69% of the height of the photograph. The eye height (measured from the bottom of the photograph to the level of the eyes) should be between 56% and 69% of the height of the photograph.

Requirements for Digital Photograph
Acquisition The image file may be produced by acquiring an image with a digital camera or by digitizing a paper photograph with a scanner.
Dimensions Image pixel dimensions must be a square, meaning the height must be equal to the width. Minimum acceptable dimensions are 600 x 600 pixels. Maximum acceptable dimensions are 1200 x 1200 pixels.
Color Must be in color (24 bits per pixel) in sRGB color space (common output of most digital cameras).
File Format Must be in JPEG format (.jpg extension)
File Size Must be less than or equal to 240 kilobytes.
Compression The image may need to be compressed in order for it to be under the maximum file size. The compression ratio should be less than or equal to 20:1.

Requirements for Scanning a Photograph
Print Size If scanning the image from a paper photograph, the size of the paper photograph should be at least 2 inches x 2 inches (51 mm x 51 mm) square.
Resolution Printed photographs should be scanned at a sampling frequency of at least 300 pixels per inch.

Image Requirements Composition
Content
  • The image must contain the full face, neck, and shoulders of the applicant in frontal view with a neutral, non-smiling expression and with eyes open and unobstructed and directed at the camera.
  • All facial features must be visible and unobstructed.
  • No extraneous objects, additional people, parts of the body below the applicant's shoulders, or other artifacts.
  • The image must be from a recent (within 6 months) photo of the applicant.
Head Size
  • The head height or facial region size (measured from the top of the head, including the hair, to the bottom of the chin) must be between 50% and 69% of the height of the image.
  • The eye height (measured from the bottom of the image to the level of the eyes) should be between 56% and 69% of the height of the image.
Head Orientation
  • Subject must directly face the camera.
  • Head must not be tilted up, down, to the side, or toward the shoulders.
  • Head must be centered within frame.
Background
  • Subject must be surrounded by a plain, light-colored background with no distracting shadows on the subject or background.
Focus
  • The entire face must be in focus and not overly sharpened.
Brightness/Contrast
  • Brightness and contrast should represent subject accurately.
Color
  • Image must be in color (24 bits per pixel).
  • Black and white photos are not acceptable.
  • Color should reproduce natural skin tones.
  • Color must be continuous tone no posterization.
Exposure/Lighting
  • Photo may not be over- or under-exposed.
  • Avoid shadows on face or background.
Resolution
  • Fine facial features should be discernible.
  • No discernible pixels/pixelization, graininess, or dot patterns.
Compression
  • Image must not be overly compressed (the compression ratio used should be less than or equal to 20:1).
Alteration
  • Digital or other alterations or retouching are not permitted.
  • When resizing, the aspect ratio of the image must be preserved (no image stretching is allowed).
Eyeglasses
  • Eyeglasses are acceptable in photo only if the lenses are not tinted and there is no glare, shadows, or rims/frames obscuring the eyes. Glare on eyeglasses can usually be avoided by a slight upward or downward tilt of the head.
  • Dark glasses or nonprescription glasses with tinted lenses are not acceptable unless you need them for medical reasons.
Decorative Items
  • No sunglasses or other items that obscure the face.
  • Hats or head coverings are only allowed if worn for religious reasons AND if they do not obscure any facial features.