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JPEG image compression FAQ, part 1/2
Section - [16] What other common compatibility problems are there?

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Top Document: JPEG image compression FAQ, part 1/2
Previous Document: [15] How do I recognize which file format I have, and what do I do about it?
Next Document: [17] How does JPEG work?
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Aside from the file format difficulties mentioned in the previous section,
there are a few other common causes of trouble with transferring JPEGs.

Old decoders that don't handle progressive JPEG will often give rather
cryptic error messages when fed a progressive JPEG.  If you get a complaint
like "Unsupported marker type 0xC2", then you definitely have a progressive
JPEG file and a non-progressive-capable decoder.  (See part 2 of this FAQ
for information about more up-to-date programs.)  Or you may get a generic
error message that claims the file is corrupted or isn't JPEG at all.

Adobe Photoshop and some other prepress-oriented applications will produce
four-channel CMYK JPEG files when asked to save a JPEG from CMYK image mode.
Hardly anything that's not prepress-savvy will cope with CMYK JPEGs (or any
other CMYK format for that matter).  When making JPEGs for Web use, be sure
to save from RGB or grayscale mode.

Photoshop also has a habit of stuffing a rather large thumbnail/preview
image into an application-private segment of JPEG files.  Some other
applications (notably early releases of Sun's Java library) are known to
choke on this data.  This is definitely a bug in those other applications,
but the best available workaround is still to tell Photoshop not to save
a thumbnail.  If you're putting up an image on the Web, having a thumbnail
embedded in it is just a waste of download time anyway.

When transferring images between machines running different operating
systems, be very careful to get a straight "binary" transfer --- any
sort of text format conversion will corrupt a JPEG file.  Actually that's
true for all image formats not just JPEG.

User Contributions:

Report this comment as inappropriate
Nov 11, 2018 @ 11:11 am
Artikel ini menjawab Pertanyaan yang Sering Diajukan tentang kompresi gambar JPEG.
Ini adalah bagian 1, yang meliputi pertanyaan umum dan jawaban tentang JPEG. Bagian 2
memberikan petunjuk khusus sistem dan rekomendasi program. Seperti biasa,
saran untuk peningkatan FAQ ini disambut baik.

Baru sejak versi 14 Maret 1999:
* Memperluas item 10 untuk mendiskusikan rotasi tanpa loss dan pemangkasan JPEG.


Artikel ini mencakup bagian-bagian berikut:

Pertanyaan dasar:

[1] Apa itu JPEG?
[2] Mengapa menggunakan JPEG?
[3] Kapan saya harus menggunakan JPEG, dan kapan saya harus tetap menggunakan GIF?
[4] Seberapa baik gambar kompresi JPEG?
[5] Pengaturan "kualitas" apa yang bagus untuk JPEG?
[6] Di mana saya bisa mendapatkan perangkat lunak JPEG?
[7] Bagaimana cara melihat gambar JPEG yang diposkan di Usenet?

Pertanyaan lanjutan lainnya:

[8] Apa itu kuantisasi warna?
[9] Apa beberapa aturan praktis untuk mengkonversi gambar GIF ke JPEG?
[10] Apakah kehilangan terakumulasi dengan kompresi / dekompresi berulang?
[11] Apa itu JPEG progresif?
[12] Dapatkah saya membuat JPEG transparan?
[13] Apakah tidak ada JPEG lossless?
[14] Mengapa semua argumen tentang format file?
[15] Bagaimana saya mengenali format file yang saya miliki, dan apa yang harus saya lakukan?
[16] Masalah kompatibilitas umum apa saja yang ada di sana?
[17] Bagaimana cara kerja JPEG?
[18] Bagaimana dengan pengkodean aritmatika?
[19] Mungkinkah FPU mempercepat JPEG? Bagaimana dengan chip DSP?
[20] Apakah tidak ada standar M-JPEG untuk film?
[21] Bagaimana jika saya membutuhkan lebih dari 8-bit presisi?
[22] Bagaimana program saya mengekstrak dimensi gambar dari file JPEG?

Miscellaneous:

[23] Di mana saya bisa belajar tentang menggunakan gambar di World Wide Web?
[24] Di mana daftar FAQ diarsipkan?


Artikel ini dan rekannya diposting setiap 2 minggu. Jika Anda tidak dapat menemukannya
Bagian 2, Anda bisa mendapatkannya dari arsip di rtfm.mit.edu
(lihat "[24] Di mana daftar FAQ diarsipkan?"). Bagian 2 sangat sering berubah;
dapatkan salinan baru jika yang Anda baca berusia lebih dari beberapa bulan.

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Top Document: JPEG image compression FAQ, part 1/2
Previous Document: [15] How do I recognize which file format I have, and what do I do about it?
Next Document: [17] How does JPEG work?

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Last Update March 27 2014 @ 02:11 PM