Indeed. I just inspected a .jpg at random and it contained the EXIF data shown below. The first field (OLYMPUS DIGITAL CAMERA) starts at offset 0xbc; and the last (JpegIFByteCount - 8092) ends at 0x2a19. On the scant basis of those two images--yours and mine--10k seem like a good starting point. For this image, that is still a substantial saving over the 677kb for the full image. 

ImageDescription - OLYMPUS DIGITAL CAMERA
Make - OLYMPUS CORPORATION
Model - E-1
Orientation - Top left
XResolution - 314.00
YResolution - 314.00
ResolutionUnit - Inch
Software - Adobe Photoshop CS4 Windows
DateTime - 2010:08:22 16:33:44
YCbCrPositioning - Co-Sited
ExifOffset - 540
ExposureTime - 1/800 seconds
FNumber - 6.30
ExposureProgram - Aperture priority
ISOSpeedRatings - 200
ExifVersion - 0221
DateTimeOriginal - 2010:08:22 11:15:59
DateTimeDigitized - 2010:08:22 11:15:59
ComponentsConfiguration - YCbCr
ExposureBiasValue - 0.00
MaxApertureValue - F 3.50
MeteringMode - Spot
LightSource - Auto
Flash - Not fired
FocalLength - 14 mm
UserComment - 
FlashPixVersion - 0100
ColorSpace - sRGB
ExifImageWidth - 2560
ExifImageHeight - 1920
InteroperabilityOffset - 1120
FileSource - DSC - Digital still camera
CustomRendered - Normal process
ExposureMode - Auto
White Balance - Auto
DigitalZoomRatio - 0.00 x
SceneCaptureType - Standard
GainControl - Low gain up
Contrast - Normal
Saturation - Normal
Sharpness - Normal

Thumbnail: - 
Compression - 6 (JPG)
XResolution - 72
YResolution - 72
ResolutionUnit - Inch
JpegIFOffset - 1246
JpegIFByteCount - 8092

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Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^3: How to download JUST the first X bytes of HTTP response ? by BrowserUk
in thread How to download JUST the first X bytes of HTTP response ? by Anonymous Monk

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