Compressione

[Clematis]

Possiedo una Olympus da 1,3Mpixel e normalmente i miei scatti, alla massima risoluzione, sono dell'ordine dei 800 Kb.
Con un qualsiasi programma di fotoritocco, semplicemente risalvando, il file diventa di circa 250 Kb.
E' normale? Probabilmente dipende dal metodo di compressione usato, ma non si perde proprio nulla? A spanne sembrerebbe di no, ma a voi cosa risulta?
Grazie e ciao.
Beppe.

[Chromo]

Originariamente inviato da Clematis
Possiedo una Olympus da 1,3Mpixel e normalmente i miei scatti, alla massima risoluzione, sono dell'ordine dei 800 Kb.
Con un qualsiasi programma di fotoritocco, semplicemente risalvando, il file diventa di circa 250 Kb.
E' normale? Probabilmente dipende dal metodo di compressione usato, ma non si perde proprio nulla? A spanne sembrerebbe di no, ma a voi cosa risulta?
Grazie e ciao.
Beppe.

800 k mi sembra tantino, è più un valore da 2 mpixel.
Forse salva in un formato non compresso?

[Clematis]

Boh!!! Questi sono i dati Exif di una delle foto

JFIF_APP1 : Exif
Main Information
ImageDescription : OLYMPUS DIGITAL CAMERA
Make : OLYMPUS OPTICAL CO.,LTD
Model : C-1Z,D-150Z
Orientation : left-hand side
XResolution : 144/1
YResolution : 144/1
ResolutionUnit : Inch
Software : 57-1015
DateTime : 2004:04:20 17:34:03
YCbCrPositioning : co-sited
ExifInfoOffset : 146
Sub Information
ExposureTime : 1/50Sec
FNumber : F3,6
ExposureProgram : Program Normal
ISOSpeedRatings : 160
ExifVersion : 0210
DateTimeOriginal : 2004:04:20 17:34:03
DateTimeDigitized : 2004:04:20 17:34:03
ComponentConfiguration : YCbCr
ExposureBiasValue : EV0,0
MaxApertureValue : F2,4
MeteringMode : Division
Flash : Fired
FocalLength : 8,89(mm)
MakerNote : Olympus Format : 698Bytes (Offset:524)
UserComment :
FlashPixVersion : 0100
ColorSpace : sRGB
ExifImageWidth : 1280
ExifImageHeight : 960
ExifInteroperabilityOffset : 482
FileSource : DSC
Vendor Original Information
Mode : Normal
Quality : 3
Macro Mode : Off
Unknown (0203)3,1 : 0
Digital Tele : X 1,00
Unknown (0205)5,1 : 57/10
Unknown (0206)8,6 : -83,-184,-226,-83,-184,-226
SoftwareVersion : D4857
CameraID : OLYMPUS DIGITAL CAMERA
Unknown (1000)10,1 : 1469/256
Unknown (1001)10,1 : 1448/256
Unknown (1002)10,1 : 909/256
Unknown (1003)10,1 : 930/256
Flash Mode : Unknown (0)
Unknown (1005)3,2 : 0,0
Bracket bias (EV) : 0/256
Unknown (1009)3,1 : 1
Unknown (100A)3,1 : 0
Focus Mode : AF
Unknown (100C)5,1 : 0/10
ZoomPosition : 10
Unknown (100E)3,1 : 224
Sharpness : NORMAL2
Unknown (1010)3,1 : 0
Unknown (1011)3,9 : 338,65438,10,65474,384,65466,2,65436,350
Unknown (1012)3,4 : 16,16,16,16
Unknown (1013)3,1 : 0
Unknown (1014)3,1 : 0
WhiteBalance : Auto
Unknown (1016)3,1 : 0
Red WB Bias : 470,64
Blue WB Bias : 368,64
Serial Number : 103151379
Unknown (101B)4,1 : 0
Unknown (101C)4,1 : 0
Unknown (101D)4,1 : 101143
Unknown (101E)4,1 : 0
Unknown (101F)4,1 : 0
Unknown (1020)4,1 : 0
Unknown (1021)4,1 : 11101
Unknown (1022)4,1 : 0
FlashStrengthBiasValue : EV+-0
Unknown (1024)3,1 : 10
Unknown (1025)10,1 : 0/256
Unknown (1026)3,1 : 0
Unknown (1027)3,1 : 0
Unknown (1028)3,1 : 0
Contrast : NORMAL
Unknown (102A)3,1 : 512
Unknown (102B)3,6 : 24,1024,768,1024,16,256
Unknown (102C)3,2 : 10,0
Unknown (102D)3,1 : 2304
Image Width : 1280
Image Height : 960
Unknown (1030)3,1 : 5
Unknown (1031)4,8 : 261695,-469860377,-65026050,2145910399,-536819070,-1601664888,0,0
Unknown (1033)4,720 : 72694,185182,110580,58612,19808,39560,63258,104514,104154,104824,84244,529142,81800,101656,156046,282548,131406,61822,147912,150024,158304,371694,66320,808916,119202,158560,244176,304020,109934,76936,206862,66750,142098,491710,147398,144892,107162,705334,275166,214274,56948,41602,88946,53354,100742,366890,235396,252644,71342,304642,210554,282452,107994,50934,39948,52654,70292,234414,236592,433422,36794,176108,141988,187184,152496,51834,45062,45072,47166,88514,214056,581412,36598,87068,161174,58900,50332,45962,45416,45030,49814,35250,56334,83692,46650,62484,81048,50080,44120,61782,40670,40940,46086,39658,43864,41304,116340,111534,48252,45236,44370,39576,36214,40516,36730,39878,43064,72524,62592,58036,34070,36776,36542,36010,40726,36064,34364,40260,41618,65920,51548,42870,36900,41322,30812,32276,63894,29746,31638,56646,43722,84560,45556,47310,36588,36502,30524,34646,38702,31794,40944,41946,73068,218380,842085605,925970480,4673610,0,814546944,1220018176,60436620,744520,875574501,942747696,4673610,0,814022656,1406599168,64696452,804761,875574501,959524912,4673610,0,814022656,1409089536,67973252,850915,875574501,808595504,4673610,0,814022656,1411579904,71381124,892700,875574501,825372720,4673610,0,814022656,1412431872,74985604,855249,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5427,1258,2733,7313,4061,5099,10590,12536,12095,10118,6039,439,7784,2420,4842,33671,20137,6539,16479,16862,12582,10668,6966,3055,7658,1251,18712,41157,17705,9605,26678,8607,18309,27748,9444,11199,9123,0,10288,25069,5764,5606,11141,5907,14161,36481,15942,9080,7320,37235,28108,12253,12259,7040,5663,5535,8776,40940,5825,3294,3347,23678,15100,22904,26217,7892,6707,5905,5934,13112,1796,315,3345,2824,2902,6585,7989,8711,7944,6618,6672,4651,3224,3878,3606,4761,4493,9643,8609,8809,7761,6935,6163,5136,4147,4022,2139,4504,5086,8539,8394,6747,6695,7034,5550,5069,3909,4002,3644,4941,4778,5624,7649,6993,7302,7375,6340,5734,3860,3849,5118,5212,5726,5617,6969,7428,10998,6409,5055,8750,4349,4530,5237,5614,5749,5443,5907,7430,6132,5922,5246,4672,3896,967,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
ExifR98
ExifR : R98
Version : 0100
Thumbnail Information
Compression : OLDJPEG
XResolution : 72/1
YResolution : 72/1
ResolutionUnit : Inch
JPEGInterchangeFormat : 6534
JPEGInterchangeFormatLength : 5565


C'è un OLDJPG nel compression, ma che vuol dire?
Ciao.
Beppe.

[zuper]

salvala in photoshop...che mantiene gli exif..

e guarda se c'è qualche differenza